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[NFC][InstCombine] Tests for shift amount reassociation in bittest with shift of const 

llvm-svn: 368517
This commit is contained in:
Roman Lebedev 2019-08-10 19:28:12 +00:00
parent c09d888632
commit 45e9990c02
1 changed files with 67 additions and 10 deletions
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77
llvm/test/Transforms/InstCombine/shift-amount-reassociation-in-bittest.ll
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@ -521,10 +521,67 @@ define i1 @t31_var_oneuse6(i32 %x, i32 %y, i32 %shamt0, i32 %shamt1) {
ret i1 %t3
}
; Shift-of-const
; Ok, non-truncated shift is of constant;
define i1 @t32_shift_of_const_oneuse0(i32 %x, i32 %y, i32 %len) {
; CHECK-LABEL: @t32_shift_of_const_oneuse0(
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[LEN:%.*]]
; CHECK-NEXT: call void @use32(i32 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i32 -52543054, [[T0]]
; CHECK-NEXT: call void @use32(i32 [[T1]])
; CHECK-NEXT: [[T2:%.*]] = add i32 [[LEN]], -1
; CHECK-NEXT: call void @use32(i32 [[T2]])
; CHECK-NEXT: [[T3:%.*]] = shl i32 [[Y:%.*]], [[T2]]
; CHECK-NEXT: call void @use32(i32 [[T3]])
; CHECK-NEXT: [[T4:%.*]] = and i32 [[T1]], [[T3]]
; CHECK-NEXT: [[T5:%.*]] = icmp ne i32 [[T4]], 0
; CHECK-NEXT: ret i1 [[T5]]
;
%t0 = sub i32 32, %len
call void @use32(i32 %t0)
%t1 = lshr i32 4242424242, %t0 ; shift-of-constant
call void @use32(i32 %t1)
%t2 = add i32 %len, -1
call void @use32(i32 %t2)
%t3 = shl i32 %y, %t2
call void @use32(i32 %t3)
%t4 = and i32 %t1, %t3 ; no extra uses
%t5 = icmp ne i32 %t4, 0
ret i1 %t5
}
; Ok, truncated shift is of constant;
define i1 @t33_shift_of_const_oneuse1(i32 %x, i32 %y, i32 %len) {
; CHECK-LABEL: @t33_shift_of_const_oneuse1(
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[LEN:%.*]]
; CHECK-NEXT: call void @use32(i32 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: call void @use32(i32 [[T1]])
; CHECK-NEXT: [[T2:%.*]] = add i32 [[LEN]], -1
; CHECK-NEXT: call void @use32(i32 [[T2]])
; CHECK-NEXT: [[T3:%.*]] = shl i32 -52543054, [[T2]]
; CHECK-NEXT: call void @use32(i32 [[T3]])
; CHECK-NEXT: [[T4:%.*]] = and i32 [[T1]], [[T3]]
; CHECK-NEXT: [[T5:%.*]] = icmp ne i32 [[T4]], 0
; CHECK-NEXT: ret i1 [[T5]]
;
%t0 = sub i32 32, %len
call void @use32(i32 %t0)
%t1 = lshr i32 %x, %t0 ; shift-of-constant
call void @use32(i32 %t1)
%t2 = add i32 %len, -1
call void @use32(i32 %t2)
%t3 = shl i32 4242424242, %t2
call void @use32(i32 %t3)
%t4 = and i32 %t1, %t3 ; no extra uses
%t5 = icmp ne i32 %t4, 0
ret i1 %t5
}
; Commutativity with extra uses
define i1 @t32_commutativity0_oneuse0(i32 %x) {
; CHECK-LABEL: @t32_commutativity0_oneuse0(
define i1 @t34_commutativity0_oneuse0(i32 %x) {
; CHECK-LABEL: @t34_commutativity0_oneuse0(
; CHECK-NEXT: [[Y:%.*]] = call i32 @gen32()
; CHECK-NEXT: [[T0:%.*]] = lshr i32 [[X:%.*]], 1
; CHECK-NEXT: call void @use32(i32 [[T0]])
@ -541,8 +598,8 @@ define i1 @t32_commutativity0_oneuse0(i32 %x) {
%t3 = icmp ne i32 %t2, 0
ret i1 %t3
}
define i1 @t33_commutativity0_oneuse1(i32 %x) {
; CHECK-LABEL: @t33_commutativity0_oneuse1(
define i1 @t35_commutativity0_oneuse1(i32 %x) {
; CHECK-LABEL: @t35_commutativity0_oneuse1(
; CHECK-NEXT: [[Y:%.*]] = call i32 @gen32()
; CHECK-NEXT: [[T1:%.*]] = shl i32 [[Y]], 1
; CHECK-NEXT: call void @use32(i32 [[T1]])
@ -560,8 +617,8 @@ define i1 @t33_commutativity0_oneuse1(i32 %x) {
ret i1 %t3
}
define i1 @t34_commutativity1_oneuse0(i32 %y) {
; CHECK-LABEL: @t34_commutativity1_oneuse0(
define i1 @t36_commutativity1_oneuse0(i32 %y) {
; CHECK-LABEL: @t36_commutativity1_oneuse0(
; CHECK-NEXT: [[X:%.*]] = call i32 @gen32()
; CHECK-NEXT: [[T0:%.*]] = lshr i32 [[X]], 1
; CHECK-NEXT: call void @use32(i32 [[T0]])
@ -578,8 +635,8 @@ define i1 @t34_commutativity1_oneuse0(i32 %y) {
%t3 = icmp ne i32 %t2, 0
ret i1 %t3
}
define i1 @t35_commutativity1_oneuse1(i32 %y) {
; CHECK-LABEL: @t35_commutativity1_oneuse1(
define i1 @t37_commutativity1_oneuse1(i32 %y) {
; CHECK-LABEL: @t37_commutativity1_oneuse1(
; CHECK-NEXT: [[X:%.*]] = call i32 @gen32()
; CHECK-NEXT: [[T1:%.*]] = shl i32 [[Y:%.*]], 1
; CHECK-NEXT: call void @use32(i32 [[T1]])
@ -598,8 +655,8 @@ define i1 @t35_commutativity1_oneuse1(i32 %y) {
}
; Negative tests
define <2 x i1> @n36_overshift(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @n36_overshift(
define <2 x i1> @n38_overshift(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @n38_overshift(
; CHECK-NEXT: [[T0:%.*]] = lshr <2 x i32> [[X:%.*]], <i32 15, i32 1>
; CHECK-NEXT: [[T1:%.*]] = shl <2 x i32> [[Y:%.*]], <i32 17, i32 1>
; CHECK-NEXT: [[T2:%.*]] = and <2 x i32> [[T1]], [[T0]]