395607af3c
This was reverted to mitigate mitigate miscompiles caused by the logical and/or to bitwise and/or fold. Reapply it now that the underlying issue has been fixed by D101191. ----- This patch folds more operations to poison. Alive2 proof: https://alive2.llvm.org/ce/z/mxcb9G (it does not contain tests about div/rem because they fold to poison when raising UB) Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D92270
70 lines
1.5 KiB
LLVM
70 lines
1.5 KiB
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
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; CHECK-LABEL: shift_undef_64
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define void @shift_undef_64(i64* %p) {
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%r1 = lshr i64 -1, 4294967296 ; 2^32
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; CHECK: store i64 poison
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store i64 %r1, i64* %p
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%r2 = ashr i64 -1, 4294967297 ; 2^32 + 1
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; CHECK: store i64 poison
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store i64 %r2, i64* %p
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%r3 = shl i64 -1, 4294967298 ; 2^32 + 2
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; CHECK: store i64 poison
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store i64 %r3, i64* %p
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ret void
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}
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; CHECK-LABEL: shift_undef_65
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define void @shift_undef_65(i65* %p) {
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%r1 = lshr i65 2, 18446744073709551617
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; CHECK: store i65 poison
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store i65 %r1, i65* %p
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%r2 = ashr i65 4, 18446744073709551617
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; CHECK: store i65 poison
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store i65 %r2, i65* %p
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%r3 = shl i65 1, 18446744073709551617
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; CHECK: store i65 poison
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store i65 %r3, i65* %p
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ret void
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}
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; CHECK-LABEL: shift_undef_256
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define void @shift_undef_256(i256* %p) {
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%r1 = lshr i256 2, 18446744073709551617
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; CHECK: store i256 poison
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store i256 %r1, i256* %p
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%r2 = ashr i256 4, 18446744073709551618
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; CHECK: store i256 poison
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store i256 %r2, i256* %p
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%r3 = shl i256 1, 18446744073709551619
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; CHECK: store i256 poison
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store i256 %r3, i256* %p
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ret void
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}
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; CHECK-LABEL: shift_undef_511
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define void @shift_undef_511(i511* %p) {
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%r1 = lshr i511 -1, 1208925819614629174706276 ; 2^80 + 100
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; CHECK: store i511 poison
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store i511 %r1, i511* %p
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%r2 = ashr i511 -2, 1208925819614629174706200
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; CHECK: store i511 poison
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store i511 %r2, i511* %p
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%r3 = shl i511 -3, 1208925819614629174706180
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; CHECK: store i511 poison
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store i511 %r3, i511* %p
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ret void
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}
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