7fa97b473c
Now that transforms introducing branch on poison have been removed, we can stop marking ranges that have been derived from branch conditions as containing undef. The existing comment explains why this is legal. I've checked that alive2 is happy with SCCP tests after this change. Differential Revision: https://reviews.llvm.org/D126647
86 lines
4.0 KiB
LLVM
86 lines
4.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=ipsccp -S %s | FileCheck %s
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@y = common global [1 x i32] zeroinitializer, align 4
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@x = common global [1 x i32] zeroinitializer, align 4
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define i32 @eq_undereferenceable(i32* %p) {
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; CHECK-LABEL: @eq_undereferenceable(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 1, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32* [[P:%.*]], getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 1, i64 0)
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; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: store i32 2, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 1, i64 0), align 4
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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; CHECK-NEXT: ret i32 [[TMP0]]
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;
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entry:
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store i32 1, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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%cmp = icmp eq i32* %p, getelementptr inbounds (i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), i64 1)
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 2, i32* %p, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%0 = load i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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ret i32 %0
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}
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define i32 @eq_dereferenceable(i32* %p) {
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; CHECK-LABEL: @eq_dereferenceable(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 1, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32* [[P:%.*]], getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0)
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; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: store i32 2, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), align 4
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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; CHECK-NEXT: ret i32 [[TMP0]]
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;
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entry:
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store i32 1, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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%cmp = icmp eq i32* %p, getelementptr inbounds (i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), i64 0)
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 2, i32* %p, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%0 = load i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @y, i64 0, i64 0), align 4
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ret i32 %0
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}
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define i1 @eq_undereferenceable_cmp_simp(i32* %p) {
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; CHECK-LABEL: @eq_undereferenceable_cmp_simp(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP_0:%.*]] = icmp eq i32* [[P:%.*]], getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 1, i64 0)
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; CHECK-NEXT: br i1 [[CMP_0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: store i32 2, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 1, i64 0), align 4
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; CHECK-NEXT: ret i1 true
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; CHECK: if.end:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%cmp.0 = icmp eq i32* %p, getelementptr inbounds (i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), i64 1)
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br i1 %cmp.0, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 2, i32* %p, align 4
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%cmp.1 = icmp eq i32* %p, getelementptr inbounds (i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), i64 1)
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ret i1 %cmp.1
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if.end: ; preds = %if.then, %entry
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%cmp.2 = icmp eq i32* %p, getelementptr inbounds (i32, i32* getelementptr inbounds ([1 x i32], [1 x i32]* @x, i64 0, i64 0), i64 1)
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ret i1 %cmp.2
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}
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