070af1b788
In https://llvm.org/PR48810 , we are crashing while trying to propagate attributes from mempcpy (returns void*) to memcpy (returns nothing - void). We can avoid the crash by removing known incompatible attributes for the void return type. I'm not sure if this goes far enough (should we just drop all attributes since this isn't the same function?). We also need to audit other transforms in LibCallSimplifier to make sure there are no other cases that have the same problem. Differential Revision: https://reviews.llvm.org/D95088
68 lines
2.7 KiB
LLVM
68 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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define i8* @memcpy_nonconst_n(i8* %d, i8* nocapture readonly %s, i64 %n) {
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; CHECK-LABEL: @memcpy_nonconst_n(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[D:%.*]], i8* align 1 [[S:%.*]], i64 [[N:%.*]], i1 false)
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, i8* [[D]], i64 [[N]]
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; CHECK-NEXT: ret i8* [[TMP1]]
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;
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%r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 %n)
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ret i8* %r
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}
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define i8* @memcpy_nonconst_n_copy_attrs(i8* %d, i8* nocapture readonly %s, i64 %n) {
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; CHECK-LABEL: @memcpy_nonconst_n_copy_attrs(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 dereferenceable(16) [[D:%.*]], i8* align 1 [[S:%.*]], i64 [[N:%.*]], i1 false)
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, i8* [[D]], i64 [[N]]
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; CHECK-NEXT: ret i8* [[TMP1]]
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;
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%r = tail call i8* @mempcpy(i8* dereferenceable(16) %d, i8* %s, i64 %n)
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ret i8* %r
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}
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define void @memcpy_nonconst_n_unused_retval(i8* %d, i8* nocapture readonly %s, i64 %n) {
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; CHECK-LABEL: @memcpy_nonconst_n_unused_retval(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[D:%.*]], i8* align 1 [[S:%.*]], i64 [[N:%.*]], i1 false)
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; CHECK-NEXT: ret void
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;
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call i8* @mempcpy(i8* %d, i8* %s, i64 %n)
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ret void
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}
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define i8* @memcpy_small_const_n(i8* %d, i8* nocapture readonly %s) {
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; CHECK-LABEL: @memcpy_small_const_n(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[S:%.*]] to i64*
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8* [[D:%.*]] to i64*
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; CHECK-NEXT: [[TMP3:%.*]] = load i64, i64* [[TMP1]], align 1
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; CHECK-NEXT: store i64 [[TMP3]], i64* [[TMP2]], align 1
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds i8, i8* [[D]], i64 8
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; CHECK-NEXT: ret i8* [[TMP4]]
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;
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%r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 8)
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ret i8* %r
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}
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define i8* @memcpy_big_const_n(i8* %d, i8* nocapture readonly %s) {
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; CHECK-LABEL: @memcpy_big_const_n(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 1 dereferenceable(1024) [[D:%.*]], i8* nonnull align 1 dereferenceable(1024) [[S:%.*]], i64 1024, i1 false)
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, i8* [[D]], i64 1024
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; CHECK-NEXT: ret i8* [[TMP1]]
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;
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%r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 1024)
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ret i8* %r
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}
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; The original call may have attributes that can not propagate to memcpy.
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define i32 @PR48810() {
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; CHECK-LABEL: @PR48810(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 undef, i8* align 536870912 null, i64 undef, i1 false)
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; CHECK-NEXT: ret i32 undef
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;
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%r = call dereferenceable(1) i8* @mempcpy(i8* undef, i8* null, i64 undef)
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ret i32 undef
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}
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declare i8* @mempcpy(i8*, i8* nocapture readonly, i64)
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