derek.holloway
7502bf64a4
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70 lines
2.2 KiB
LLVM
70 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -S < %s -passes=gvn | FileCheck %s
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declare void @llvm.sideeffect()
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; Store-to-load forwarding across a @llvm.sideeffect.
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define float @s2l(ptr %p) {
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; CHECK-LABEL: define float @s2l(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: store float 0.000000e+00, ptr [[P]], align 4
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; CHECK-NEXT: call void @llvm.sideeffect()
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; CHECK-NEXT: ret float 0.000000e+00
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;
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store float 0.0, ptr %p
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call void @llvm.sideeffect()
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%t = load float, ptr %p
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ret float %t
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}
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; Redundant load elimination across a @llvm.sideeffect.
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define float @rle(ptr %p) {
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; CHECK-LABEL: define float @rle(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = load float, ptr [[P]], align 4
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; CHECK-NEXT: call void @llvm.sideeffect()
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; CHECK-NEXT: [[T:%.*]] = fadd float [[R]], [[R]]
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; CHECK-NEXT: ret float [[T]]
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;
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%r = load float, ptr %p
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call void @llvm.sideeffect()
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%s = load float, ptr %p
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%t = fadd float %r, %s
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ret float %t
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}
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; LICM across a @llvm.sideeffect.
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define float @licm(i64 %n, ptr nocapture readonly %p) #0 {
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; CHECK-LABEL: define float @licm(
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; CHECK-SAME: i64 [[N:%.*]], ptr readonly captures(none) [[P:%.*]]) {
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; CHECK-NEXT: [[BB0:.*]]:
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; CHECK-NEXT: [[T3_PRE:%.*]] = load float, ptr [[P]], align 4
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, %[[BB0]] ], [ [[T5:%.*]], %[[LOOP]] ]
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; CHECK-NEXT: [[SUM:%.*]] = phi float [ 0.000000e+00, %[[BB0]] ], [ [[T4:%.*]], %[[LOOP]] ]
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; CHECK-NEXT: call void @llvm.sideeffect()
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; CHECK-NEXT: [[T4]] = fadd float [[SUM]], [[T3_PRE]]
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; CHECK-NEXT: [[T5]] = add i64 [[I]], 1
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; CHECK-NEXT: [[T6:%.*]] = icmp ult i64 [[T5]], [[N]]
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; CHECK-NEXT: br i1 [[T6]], label %[[LOOP]], label %[[BB2:.*]]
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; CHECK: [[BB2]]:
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; CHECK-NEXT: ret float [[T4]]
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;
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bb0:
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br label %loop
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loop:
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%i = phi i64 [ 0, %bb0 ], [ %t5, %loop ]
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%sum = phi float [ 0.000000e+00, %bb0 ], [ %t4, %loop ]
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call void @llvm.sideeffect()
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%t3 = load float, ptr %p
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%t4 = fadd float %sum, %t3
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%t5 = add i64 %i, 1
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%t6 = icmp ult i64 %t5, %n
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br i1 %t6, label %loop, label %bb2
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bb2:
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ret float %t4
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}
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