a24cc48bc6
This shows a miscompile in the current argpromotion implementation: We may speculatively execute overaligned loads.
85 lines
2.7 KiB
LLVM
85 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
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; RUN: opt -S -argpromotion < %s | FileCheck %s
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define internal i32 @callee_must_exec(i32* %p) {
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; CHECK-LABEL: define {{[^@]+}}@callee_must_exec
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; CHECK-SAME: (i32 [[P_VAL:%.*]]) {
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; CHECK-NEXT: ret i32 [[P_VAL]]
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;
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%x = load i32, i32* %p, align 16
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ret i32 %x
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}
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define void @caller_must_exec(i32* %p) {
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; CHECK-LABEL: define {{[^@]+}}@caller_must_exec
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; CHECK-SAME: (i32* [[P:%.*]]) {
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; CHECK-NEXT: [[P_VAL:%.*]] = load i32, i32* [[P]], align 16
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @callee_must_exec(i32 [[P_VAL]])
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; CHECK-NEXT: ret void
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;
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call i32 @callee_must_exec(i32* %p)
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ret void
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}
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define internal i32 @callee_guaranteed_aligned(i1 %c, i32* %p) {
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; CHECK-LABEL: define {{[^@]+}}@callee_guaranteed_aligned
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; CHECK-SAME: (i1 [[C:%.*]], i32 [[P_VAL:%.*]]) {
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; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: ret i32 [[P_VAL]]
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; CHECK: else:
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; CHECK-NEXT: ret i32 -1
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;
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br i1 %c, label %if, label %else
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if:
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%x = load i32, i32* %p, align 16
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ret i32 %x
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else:
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ret i32 -1
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}
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define void @caller_guaranteed_aligned(i1 %c, i32* align 16 dereferenceable(4) %p) {
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; CHECK-LABEL: define {{[^@]+}}@caller_guaranteed_aligned
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; CHECK-SAME: (i1 [[C:%.*]], i32* align 16 dereferenceable(4) [[P:%.*]]) {
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; CHECK-NEXT: [[P_VAL:%.*]] = load i32, i32* [[P]], align 16
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @callee_guaranteed_aligned(i1 [[C]], i32 [[P_VAL]])
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; CHECK-NEXT: ret void
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;
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call i32 @callee_guaranteed_aligned(i1 %c, i32* %p)
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ret void
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}
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; TODO: This should not be promoted, as the caller only guarantees that the
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; pointer is dereferenceable, not that it is aligned.
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define internal i32 @callee_not_guaranteed_aligned(i1 %c, i32* %p) {
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; CHECK-LABEL: define {{[^@]+}}@callee_not_guaranteed_aligned
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; CHECK-SAME: (i1 [[C:%.*]], i32 [[P_VAL:%.*]]) {
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; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: ret i32 [[P_VAL]]
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; CHECK: else:
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; CHECK-NEXT: ret i32 -1
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;
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br i1 %c, label %if, label %else
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if:
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%x = load i32, i32* %p, align 16
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ret i32 %x
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else:
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ret i32 -1
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}
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define void @caller_not_guaranteed_aligned(i1 %c, i32* dereferenceable(4) %p) {
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; CHECK-LABEL: define {{[^@]+}}@caller_not_guaranteed_aligned
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; CHECK-SAME: (i1 [[C:%.*]], i32* dereferenceable(4) [[P:%.*]]) {
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; CHECK-NEXT: [[P_VAL:%.*]] = load i32, i32* [[P]], align 16
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @callee_not_guaranteed_aligned(i1 [[C]], i32 [[P_VAL]])
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; CHECK-NEXT: ret void
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;
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call i32 @callee_not_guaranteed_aligned(i1 %c, i32* %p)
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ret void
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}
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