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llvm-project/llvm/test/Transforms/InstCombine/select_arithmetic.ll

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[InstCombine] Add select simplifications In these cases, two selects have constant selectable operands for both the true and false components and have the same conditional expression. We then create two arithmetic operations of the same type and feed a final select operation using the result of the true arithmetic for the true operand and the result of the false arithmetic for the false operand and reuse the original conditionl expression. The arithmetic operations are naturally folded as a consequence, leaving only the newly formed select to replace the old arithmetic operation. Patch by: Michael Berg <michael_c_berg@apple.com> Differential Revision: https://reviews.llvm.org/D37019 llvm-svn: 313774
2017-09-21 01:32:16 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
; Tests folding constants from two similar selects that feed a add
define float @test1(i1 zeroext %arg) #0 {
%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
%tmp2 = fadd float %tmp, %tmp1
ret float %tmp2
; CHECK-LABEL: @test1(
; CHECK: %tmp2 = select i1 %arg, float 6.000000e+00, float 1.500000e+01
; CHECK-NOT: fadd
; CHECK: ret float %tmp2
}
; Tests folding constants from two similar selects that feed a sub
define float @test2(i1 zeroext %arg) #0 {
%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
%tmp2 = fsub float %tmp, %tmp1
ret float %tmp2
; CHECK-LABEL: @test2(
; CHECK: %tmp2 = select i1 %arg, float 4.000000e+00, float -3.000000e+00
; CHECK-NOT: fsub
; CHECK: ret float %tmp2
}
; Tests folding constants from two similar selects that feed a mul
define float @test3(i1 zeroext %arg) #0 {
%tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00
%tmp1 = select i1 %arg, float 1.000000e+00, float 9.000000e+00
%tmp2 = fmul float %tmp, %tmp1
ret float %tmp2
; CHECK-LABEL: @test3(
; CHECK: %tmp2 = select i1 %arg, float 5.000000e+00, float 5.400000e+01
; CHECK-NOT: fmul
; CHECK: ret float %tmp2
}