forked from OSchip/llvm-project
480 lines
13 KiB
LLVM
480 lines
13 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; testing-case "float fold(float a) { return 1.2f * a * 2.3f; }"
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; 1.2f and 2.3f is supposed to be fold.
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define float @fold(float %a) {
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%mul = fmul fast float %a, 0x3FF3333340000000
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%mul1 = fmul fast float %mul, 0x4002666660000000
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ret float %mul1
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; CHECK-LABEL: @fold(
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; CHECK: fmul fast float %a, 0x4006147AE0000000
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}
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; Same testing-case as the one used in fold() except that the operators have
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; fixed FP mode.
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define float @notfold(float %a) {
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; CHECK-LABEL: @notfold(
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; CHECK: %mul = fmul fast float %a, 0x3FF3333340000000
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%mul = fmul fast float %a, 0x3FF3333340000000
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%mul1 = fmul float %mul, 0x4002666660000000
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ret float %mul1
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}
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define float @fold2(float %a) {
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; CHECK-LABEL: @fold2(
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; CHECK: fmul fast float %a, 0x4006147AE0000000
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%mul = fmul float %a, 0x3FF3333340000000
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%mul1 = fmul fast float %mul, 0x4002666660000000
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ret float %mul1
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}
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; C * f1 + f1 = (C+1) * f1
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define double @fold3(double %f1) {
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%t1 = fmul fast double 2.000000e+00, %f1
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%t2 = fadd fast double %f1, %t1
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ret double %t2
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; CHECK-LABEL: @fold3(
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; CHECK: fmul fast double %f1, 3.000000e+00
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}
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; (C1 - X) + (C2 - Y) => (C1+C2) - (X + Y)
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define float @fold4(float %f1, float %f2) {
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%sub = fsub float 4.000000e+00, %f1
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%sub1 = fsub float 5.000000e+00, %f2
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%add = fadd fast float %sub, %sub1
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ret float %add
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; CHECK-LABEL: @fold4(
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; CHECK: %1 = fadd fast float %f1, %f2
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; CHECK: fsub fast float 9.000000e+00, %1
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}
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; (X + C1) + C2 => X + (C1 + C2)
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define float @fold5(float %f1, float %f2) {
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%add = fadd float %f1, 4.000000e+00
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%add1 = fadd fast float %add, 5.000000e+00
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ret float %add1
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; CHECK-LABEL: @fold5(
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; CHECK: fadd fast float %f1, 9.000000e+00
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}
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; (X + X) + X => 3.0 * X
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define float @fold6(float %f1) {
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%t1 = fadd fast float %f1, %f1
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%t2 = fadd fast float %f1, %t1
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ret float %t2
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; CHECK-LABEL: @fold6(
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; CHECK: fmul fast float %f1, 3.000000e+00
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}
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; C1 * X + (X + X) = (C1 + 2) * X
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define float @fold7(float %f1) {
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%t1 = fmul fast float %f1, 5.000000e+00
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%t2 = fadd fast float %f1, %f1
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%t3 = fadd fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fold7(
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; CHECK: fmul fast float %f1, 7.000000e+00
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}
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; (X + X) + (X + X) => 4.0 * X
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define float @fold8(float %f1) {
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%t1 = fadd fast float %f1, %f1
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%t2 = fadd fast float %f1, %f1
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%t3 = fadd fast float %t1, %t2
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ret float %t3
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; CHECK: fold8
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; CHECK: fmul fast float %f1, 4.000000e+00
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}
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; X - (X + Y) => 0 - Y
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define float @fold9(float %f1, float %f2) {
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%t1 = fadd float %f1, %f2
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%t3 = fsub fast float %f1, %t1
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ret float %t3
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; CHECK-LABEL: @fold9(
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; CHECK: fsub fast float 0.000000e+00, %f2
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}
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; Let C3 = C1 + C2. (f1 + C1) + (f2 + C2) => (f1 + f2) + C3 instead of
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; "(f1 + C3) + f2" or "(f2 + C3) + f1". Placing constant-addend at the
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; top of resulting simplified expression tree may potentially reveal some
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; optimization opportunities in the super-expression trees.
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;
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define float @fold10(float %f1, float %f2) {
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%t1 = fadd fast float 2.000000e+00, %f1
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%t2 = fsub fast float %f2, 3.000000e+00
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%t3 = fadd fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fold10(
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; CHECK: %t3 = fadd fast float %t2, -1.000000e+00
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; CHECK: ret float %t3
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}
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; once cause Crash/miscompilation
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define float @fail1(float %f1, float %f2) {
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%conv3 = fadd fast float %f1, -1.000000e+00
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%add = fadd fast float %conv3, %conv3
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%add2 = fadd fast float %add, %conv3
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ret float %add2
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; CHECK-LABEL: @fail1(
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; CHECK: ret
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}
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define double @fail2(double %f1, double %f2) {
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%t1 = fsub fast double %f1, %f2
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%t2 = fadd fast double %f1, %f2
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%t3 = fsub fast double %t1, %t2
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ret double %t3
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; CHECK-LABEL: @fail2(
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; CHECK: ret
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}
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; c1 * x - x => (c1 - 1.0) * x
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define float @fold13(float %x) {
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%mul = fmul fast float %x, 7.000000e+00
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%sub = fsub fast float %mul, %x
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ret float %sub
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; CHECK: fold13
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; CHECK: fmul fast float %x, 6.000000e+00
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; CHECK: ret
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}
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; =========================================================================
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;
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; Testing-cases about fmul begin
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;
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; =========================================================================
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; ((X*C1) + C2) * C3 => (X * (C1*C3)) + (C2*C3) (i.e. distribution)
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define float @fmul_distribute1(float %f1) {
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%t1 = fmul float %f1, 6.0e+3
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%t2 = fadd float %t1, 2.0e+3
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%t3 = fmul fast float %t2, 5.0e+3
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ret float %t3
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; CHECK-LABEL: @fmul_distribute1(
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; CHECK: %1 = fmul fast float %f1, 3.000000e+07
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; CHECK: %t3 = fadd fast float %1, 1.000000e+07
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}
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; (X/C1 + C2) * C3 => X/(C1/C3) + C2*C3
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define double @fmul_distribute2(double %f1, double %f2) {
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%t1 = fdiv double %f1, 3.0e+0
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%t2 = fadd double %t1, 5.0e+1
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; 0x10000000000000 = DBL_MIN
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%t3 = fmul fast double %t2, 0x10000000000000
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ret double %t3
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; CHECK-LABEL: @fmul_distribute2(
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; CHECK: %1 = fdiv fast double %f1, 0x7FE8000000000000
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; CHECK: fadd fast double %1, 0x69000000000000
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}
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; 5.0e-1 * DBL_MIN yields denormal, so "(f1*3.0 + 5.0e-1) * DBL_MIN" cannot
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; be simplified into f1 * (3.0*DBL_MIN) + (5.0e-1*DBL_MIN)
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define double @fmul_distribute3(double %f1) {
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%t1 = fdiv double %f1, 3.0e+0
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%t2 = fadd double %t1, 5.0e-1
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%t3 = fmul fast double %t2, 0x10000000000000
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ret double %t3
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; CHECK-LABEL: @fmul_distribute3(
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; CHECK: fmul fast double %t2, 0x10000000000000
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}
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; ((X*C1) + C2) * C3 => (X * (C1*C3)) + (C2*C3) (i.e. distribution)
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define float @fmul_distribute4(float %f1) {
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%t1 = fmul float %f1, 6.0e+3
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%t2 = fsub float 2.0e+3, %t1
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%t3 = fmul fast float %t2, 5.0e+3
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ret float %t3
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; CHECK-LABEL: @fmul_distribute4(
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; CHECK: %1 = fmul fast float %f1, 3.000000e+07
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; CHECK: %t3 = fsub fast float 1.000000e+07, %1
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}
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; C1/X * C2 => (C1*C2) / X
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define float @fmul2(float %f1) {
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%t1 = fdiv float 2.0e+3, %f1
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%t3 = fmul fast float %t1, 6.0e+3
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ret float %t3
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; CHECK-LABEL: @fmul2(
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; CHECK: fdiv fast float 1.200000e+07, %f1
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}
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; X/C1 * C2 => X * (C2/C1) is disabled if X/C1 has multiple uses
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@fmul2_external = external global float
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define float @fmul2_disable(float %f1) {
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%div = fdiv fast float 1.000000e+00, %f1
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store float %div, float* @fmul2_external
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%mul = fmul fast float %div, 2.000000e+00
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ret float %mul
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; CHECK-LABEL: @fmul2_disable
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; CHECK: store
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; CHECK: fmul fast
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}
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; X/C1 * C2 => X * (C2/C1) (if C2/C1 is normal Fp)
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define float @fmul3(float %f1, float %f2) {
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%t1 = fdiv float %f1, 2.0e+3
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%t3 = fmul fast float %t1, 6.0e+3
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ret float %t3
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; CHECK-LABEL: @fmul3(
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; CHECK: fmul fast float %f1, 3.000000e+00
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}
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; Rule "X/C1 * C2 => X * (C2/C1) is not applicable if C2/C1 is either a special
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; value of a denormal. The 0x3810000000000000 here take value FLT_MIN
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;
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define float @fmul4(float %f1, float %f2) {
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%t1 = fdiv float %f1, 2.0e+3
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%t3 = fmul fast float %t1, 0x3810000000000000
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ret float %t3
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; CHECK-LABEL: @fmul4(
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; CHECK: fmul fast float %t1, 0x3810000000000000
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}
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; X / C1 * C2 => X / (C2/C1) if C1/C2 is either a special value of a denormal,
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; and C2/C1 is a normal value.
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;
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define float @fmul5(float %f1, float %f2) {
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%t1 = fdiv float %f1, 3.0e+0
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%t3 = fmul fast float %t1, 0x3810000000000000
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ret float %t3
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; CHECK-LABEL: @fmul5(
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; CHECK: fdiv fast float %f1, 0x47E8000000000000
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}
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; (X*Y) * X => (X*X) * Y
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define float @fmul6(float %f1, float %f2) {
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%mul = fmul float %f1, %f2
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%mul1 = fmul fast float %mul, %f1
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ret float %mul1
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; CHECK-LABEL: @fmul6(
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; CHECK: fmul fast float %f1, %f1
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}
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; "(X*Y) * X => (X*X) * Y" is disabled if "X*Y" has multiple uses
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define float @fmul7(float %f1, float %f2) {
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%mul = fmul float %f1, %f2
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%mul1 = fmul fast float %mul, %f1
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%add = fadd float %mul1, %mul
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ret float %add
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; CHECK-LABEL: @fmul7(
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; CHECK: fmul fast float %mul, %f1
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}
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; =========================================================================
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;
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; Testing-cases about negation
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;
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; =========================================================================
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define float @fneg1(float %f1, float %f2) {
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%sub = fsub float -0.000000e+00, %f1
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%sub1 = fsub nsz float 0.000000e+00, %f2
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%mul = fmul float %sub, %sub1
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ret float %mul
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; CHECK-LABEL: @fneg1(
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; CHECK: fmul float %f1, %f2
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}
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; =========================================================================
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;
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; Testing-cases about div
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;
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; =========================================================================
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; X/C1 / C2 => X * (1/(C2*C1))
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define float @fdiv1(float %x) {
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%div = fdiv float %x, 0x3FF3333340000000
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%div1 = fdiv fast float %div, 0x4002666660000000
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ret float %div1
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; 0x3FF3333340000000 = 1.2f
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; 0x4002666660000000 = 2.3f
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; 0x3FD7303B60000000 = 0.36231884057971014492
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; CHECK-LABEL: @fdiv1(
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; CHECK: fmul fast float %x, 0x3FD7303B60000000
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}
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; X*C1 / C2 => X * (C1/C2)
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define float @fdiv2(float %x) {
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%mul = fmul float %x, 0x3FF3333340000000
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%div1 = fdiv fast float %mul, 0x4002666660000000
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ret float %div1
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; 0x3FF3333340000000 = 1.2f
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; 0x4002666660000000 = 2.3f
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; 0x3FE0B21660000000 = 0.52173918485641479492
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; CHECK-LABEL: @fdiv2(
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; CHECK: fmul fast float %x, 0x3FE0B21660000000
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}
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; "X/C1 / C2 => X * (1/(C2*C1))" is disabled (for now) is C2/C1 is a denormal
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;
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define float @fdiv3(float %x) {
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%div = fdiv float %x, 0x47EFFFFFE0000000
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%div1 = fdiv fast float %div, 0x4002666660000000
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ret float %div1
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; CHECK-LABEL: @fdiv3(
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; CHECK: fdiv float %x, 0x47EFFFFFE0000000
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}
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; "X*C1 / C2 => X * (C1/C2)" is disabled if C1/C2 is a denormal
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define float @fdiv4(float %x) {
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%mul = fmul float %x, 0x47EFFFFFE0000000
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%div = fdiv float %mul, 0x3FC99999A0000000
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ret float %div
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; CHECK-LABEL: @fdiv4(
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; CHECK: fmul float %x, 0x47EFFFFFE0000000
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}
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; (X/Y)/Z = > X/(Y*Z)
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define float @fdiv5(float %f1, float %f2, float %f3) {
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%t1 = fdiv float %f1, %f2
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%t2 = fdiv fast float %t1, %f3
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ret float %t2
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; CHECK-LABEL: @fdiv5(
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; CHECK: fmul float %f2, %f3
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}
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; Z/(X/Y) = > (Z*Y)/X
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define float @fdiv6(float %f1, float %f2, float %f3) {
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%t1 = fdiv float %f1, %f2
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%t2 = fdiv fast float %f3, %t1
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ret float %t2
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; CHECK-LABEL: @fdiv6(
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; CHECK: fmul float %f3, %f2
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}
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; C1/(X*C2) => (C1/C2) / X
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define float @fdiv7(float %x) {
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%t1 = fmul float %x, 3.0e0
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%t2 = fdiv fast float 15.0e0, %t1
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ret float %t2
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; CHECK-LABEL: @fdiv7(
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; CHECK: fdiv fast float 5.000000e+00, %x
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}
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; C1/(X/C2) => (C1*C2) / X
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define float @fdiv8(float %x) {
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%t1 = fdiv float %x, 3.0e0
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%t2 = fdiv fast float 15.0e0, %t1
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ret float %t2
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; CHECK-LABEL: @fdiv8(
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; CHECK: fdiv fast float 4.500000e+01, %x
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}
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; C1/(C2/X) => (C1/C2) * X
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define float @fdiv9(float %x) {
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%t1 = fdiv float 3.0e0, %x
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%t2 = fdiv fast float 15.0e0, %t1
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ret float %t2
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; CHECK-LABEL: @fdiv9(
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; CHECK: fmul fast float %x, 5.000000e+00
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}
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; =========================================================================
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;
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; Testing-cases about factorization
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;
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; =========================================================================
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; x*z + y*z => (x+y) * z
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define float @fact_mul1(float %x, float %y, float %z) {
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%t1 = fmul fast float %x, %z
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%t2 = fmul fast float %y, %z
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%t3 = fadd fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fact_mul1(
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; CHECK: fmul fast float %1, %z
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}
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; z*x + y*z => (x+y) * z
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define float @fact_mul2(float %x, float %y, float %z) {
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%t1 = fmul fast float %z, %x
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%t2 = fmul fast float %y, %z
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%t3 = fsub fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fact_mul2(
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; CHECK: fmul fast float %1, %z
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}
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; z*x - z*y => (x-y) * z
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define float @fact_mul3(float %x, float %y, float %z) {
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%t2 = fmul fast float %z, %y
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%t1 = fmul fast float %z, %x
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%t3 = fsub fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fact_mul3(
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; CHECK: fmul fast float %1, %z
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}
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; x*z - z*y => (x-y) * z
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define float @fact_mul4(float %x, float %y, float %z) {
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%t1 = fmul fast float %x, %z
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%t2 = fmul fast float %z, %y
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%t3 = fsub fast float %t1, %t2
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ret float %t3
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; CHECK-LABEL: @fact_mul4(
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; CHECK: fmul fast float %1, %z
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}
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; x/y + x/z, no xform
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define float @fact_div1(float %x, float %y, float %z) {
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%t1 = fdiv fast float %x, %y
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%t2 = fdiv fast float %x, %z
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%t3 = fadd fast float %t1, %t2
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ret float %t3
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; CHECK: fact_div1
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; CHECK: fadd fast float %t1, %t2
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}
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; x/y + z/x; no xform
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define float @fact_div2(float %x, float %y, float %z) {
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%t1 = fdiv fast float %x, %y
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%t2 = fdiv fast float %z, %x
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%t3 = fadd fast float %t1, %t2
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|
ret float %t3
|
|
; CHECK: fact_div2
|
|
; CHECK: fadd fast float %t1, %t2
|
|
}
|
|
|
|
; y/x + z/x => (y+z)/x
|
|
define float @fact_div3(float %x, float %y, float %z) {
|
|
%t1 = fdiv fast float %y, %x
|
|
%t2 = fdiv fast float %z, %x
|
|
%t3 = fadd fast float %t1, %t2
|
|
ret float %t3
|
|
; CHECK: fact_div3
|
|
; CHECK: fdiv fast float %1, %x
|
|
}
|
|
|
|
; y/x - z/x => (y-z)/x
|
|
define float @fact_div4(float %x, float %y, float %z) {
|
|
%t1 = fdiv fast float %y, %x
|
|
%t2 = fdiv fast float %z, %x
|
|
%t3 = fsub fast float %t1, %t2
|
|
ret float %t3
|
|
; CHECK: fact_div4
|
|
; CHECK: fdiv fast float %1, %x
|
|
}
|
|
|
|
; y/x - z/x => (y-z)/x is disabled if y-z is denormal.
|
|
define float @fact_div5(float %x) {
|
|
%t1 = fdiv fast float 0x3810000000000000, %x
|
|
%t2 = fdiv fast float 0x3800000000000000, %x
|
|
%t3 = fadd fast float %t1, %t2
|
|
ret float %t3
|
|
; CHECK: fact_div5
|
|
; CHECK: fdiv fast float 0x3818000000000000, %x
|
|
}
|
|
|
|
; y/x - z/x => (y-z)/x is disabled if y-z is denormal.
|
|
define float @fact_div6(float %x) {
|
|
%t1 = fdiv fast float 0x3810000000000000, %x
|
|
%t2 = fdiv fast float 0x3800000000000000, %x
|
|
%t3 = fsub fast float %t1, %t2
|
|
ret float %t3
|
|
; CHECK: fact_div6
|
|
; CHECK: %t3 = fsub fast float %t1, %t2
|
|
}
|