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[GlobalISel] Fold bitcast(undef) to undef. (#111491)

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As with other operations such as trunc and fp converts, it should be
valid to convert bitcast(undef) to undef.
This commit is contained in:
David Green 2024-10-09 07:42:40 +01:00 committed by GitHub
parent ada6372e52
commit 3bf33ecec8
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GPG Key ID: B5690EEEBB952194
2 changed files with 5 additions and 16 deletions
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2
llvm/include/llvm/Target/GlobalISel/Combine.td
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@ -420,7 +420,7 @@ def unary_undef_to_zero: GICombineRule<
// replaced with undef.
def propagate_undef_any_op: GICombineRule<
(defs root:$root),
(match (wip_match_opcode G_ADD, G_FPTOSI, G_FPTOUI, G_SUB, G_XOR, G_TRUNC):$root,
(match (wip_match_opcode G_ADD, G_FPTOSI, G_FPTOUI, G_SUB, G_XOR, G_TRUNC, G_BITCAST):$root,
[{ return Helper.matchAnyExplicitUseIsUndef(*${root}); }]),
(apply [{ Helper.replaceInstWithUndef(*${root}); }])>;

19
llvm/test/CodeGen/AArch64/concat-vector.ll
View File

@ -189,9 +189,6 @@ define <8 x i16> @concat_v8s16_v2s16(ptr %ptr) {
; CHECK-GI-NEXT: xtn v0.4h, v0.4s
; CHECK-GI-NEXT: fmov w8, s0
; CHECK-GI-NEXT: mov v0.s[0], w8
; CHECK-GI-NEXT: mov v0.s[1], w8
; CHECK-GI-NEXT: mov v0.s[2], w8
; CHECK-GI-NEXT: mov v0.s[3], w8
; CHECK-GI-NEXT: ret
%a = load <2 x i16>, ptr %ptr
%b = shufflevector <2 x i16> %a, <2 x i16> %a, <8 x i32> <i32 0, i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
@ -199,18 +196,10 @@ define <8 x i16> @concat_v8s16_v2s16(ptr %ptr) {
}
define <16 x i8> @concat_v16s8_v4s8(ptr %ptr) {
; CHECK-SD-LABEL: concat_v16s8_v4s8:
; CHECK-SD: // %bb.0:
; CHECK-SD-NEXT: ldr s0, [x0]
; CHECK-SD-NEXT: ret
;
; CHECK-GI-LABEL: concat_v16s8_v4s8:
; CHECK-GI: // %bb.0:
; CHECK-GI-NEXT: ldr s0, [x0]
; CHECK-GI-NEXT: mov v0.s[1], w8
; CHECK-GI-NEXT: mov v0.s[2], w8
; CHECK-GI-NEXT: mov v0.s[3], w8
; CHECK-GI-NEXT: ret
; CHECK-LABEL: concat_v16s8_v4s8:
; CHECK: // %bb.0:
; CHECK-NEXT: ldr s0, [x0]
; CHECK-NEXT: ret
%a = load <4 x i8>, ptr %ptr
%b = shufflevector <4 x i8> %a, <4 x i8> %a, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
ret <16 x i8> %b