88 lines
2.9 KiB
LLVM
88 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=globalopt < %s -S | FileCheck %s
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@i = internal unnamed_addr global i32 1, align 4
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@r = internal global i64 0, align 8
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; negative test for store-once-global - the urem constant expression must not be speculated
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declare dso_local void @use(i32)
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define i32 @cantrap_constant() {
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; CHECK-LABEL: @cantrap_constant(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @i, align 4
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0
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; CHECK-NEXT: [[NOT_TOBOOL:%.*]] = xor i1 [[TOBOOL]], true
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = zext i1 [[NOT_TOBOOL]] to i32
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; CHECK-NEXT: tail call void @use(i32 [[SPEC_SELECT]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_THEN:%.*]], label [[EXIT:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: store i32 trunc (i64 urem (i64 7, i64 zext (i1 icmp eq (i64* inttoptr (i64 1 to i64*), i64* @r) to i64)) to i32), i32* @i, align 4
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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%0 = load i32, i32* @i, align 4
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%tobool = icmp eq i32 %0, 0
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%not.tobool = xor i1 %tobool, true
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%spec.select = zext i1 %not.tobool to i32
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tail call void @use(i32 %spec.select)
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br i1 %tobool, label %if.then, label %exit
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if.then:
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store i32 trunc (i64 urem (i64 7, i64 zext (i1 icmp eq (i64* inttoptr (i64 1 to i64*), i64* @r) to i64)) to i32), i32* @i, align 4
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br label %exit
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exit:
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ret i32 0
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}
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; negative test for store-once-global - the srem constant expression must not be speculated
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@b1 = internal global i64* null, align 8
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@d1 = internal unnamed_addr global i32 0, align 2
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define void @maytrap() {
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; CHECK-LABEL: @maytrap(
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; CHECK-NEXT: store i32 srem (i32 7, i32 zext (i1 icmp eq (i64** inttoptr (i64 16 to i64**), i64** @b1) to i32)), i32* @d1, align 2
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; CHECK-NEXT: ret void
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;
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store i32 srem (i32 7, i32 zext (i1 icmp eq (i64** inttoptr (i64 16 to i64**), i64** @b1) to i32)), i32* @d1, align 2
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ret void
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}
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define i32 @main1() {
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; CHECK-LABEL: @main1(
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; CHECK-NEXT: [[T0:%.*]] = load i32, i32* @d1, align 2
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; CHECK-NEXT: ret i32 [[T0]]
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;
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%t0 = load i32, i32* @d1, align 2
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ret i32 %t0
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}
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; This is fine to optimize as a store-once-global constant because the expression can't trap
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@b2 = internal global i64* null, align 8
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@d2 = internal unnamed_addr global i32 0, align 2
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define void @maynottrap() {
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; CHECK-LABEL: @maynottrap(
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; CHECK-NEXT: store i1 true, i1* @d2, align 1
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; CHECK-NEXT: ret void
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;
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store i32 mul (i32 7, i32 zext (i1 icmp eq (i64** inttoptr (i64 16 to i64**), i64** @b2) to i32)), i32* @d2, align 2
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ret void
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}
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define i32 @main2() {
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; CHECK-LABEL: @main2(
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; CHECK-NEXT: [[T0_B:%.*]] = load i1, i1* @d2, align 1
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; CHECK-NEXT: [[T0:%.*]] = select i1 [[T0_B]], i32 mul (i32 zext (i1 icmp eq (i64** inttoptr (i64 16 to i64**), i64** @b2) to i32), i32 7), i32 0
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; CHECK-NEXT: ret i32 [[T0]]
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;
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%t0 = load i32, i32* @d2, align 2
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ret i32 %t0
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}
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