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[WebAssembly] Optimize away mask of 63 for shl ( zext (and i32 63))) #152397

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Merged
merged 4 commits into from
Dec 1, 2025
+19 −1
Merged

[WebAssembly] Optimize away mask of 63 for shl ( zext (and i32 63))) #152397

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b707a7d
Precommit test
badumbatish Aug 6, 2025
40e9092
Optimize away mask of 63 for shl ( zext (and i32 63)))
badumbatish Aug 7, 2025
8f1cd06
Simplify "Optimize away mask of 63 for shl ( zext (and i32 63)))"
badumbatish Nov 28, 2025
cc4b02f
Rename test case
badumbatish Dec 1, 2025
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2 changes: 1 addition & 1 deletion llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
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Original file line number Diff line number Diff line change
Expand Up @@ -460,8 +460,8 @@ def : Pat<(i64 (WebAssemblyWrapperREL texternalsym:$addr)),
include "WebAssemblyInstrMemory.td"
include "WebAssemblyInstrCall.td"
include "WebAssemblyInstrControl.td"
include "WebAssemblyInstrInteger.td"
include "WebAssemblyInstrConv.td"
include "WebAssemblyInstrInteger.td"
include "WebAssemblyInstrFloat.td"
include "WebAssemblyInstrAtomics.td"
include "WebAssemblyInstrSIMD.td"
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3 changes: 3 additions & 0 deletions llvm/lib/Target/WebAssembly/WebAssemblyInstrInteger.td
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Expand Up @@ -107,6 +107,9 @@ def : Pat<(rotr I32:$lhs, (and I32:$rhs, 31)), (ROTR_I32 I32:$lhs, I32:$rhs)>;
def : Pat<(rotl I64:$lhs, (and I64:$rhs, 63)), (ROTL_I64 I64:$lhs, I64:$rhs)>;
def : Pat<(rotr I64:$lhs, (and I64:$rhs, 63)), (ROTR_I64 I64:$lhs, I64:$rhs)>;

def : Pat<(shl I64:$lhs, (zext (and I32:$rhs, 63))),
(SHL_I64 I64:$lhs, (I64_EXTEND_U_I32 I32:$rhs))>;

defm SELECT_I32 : I<(outs I32:$dst), (ins I32:$lhs, I32:$rhs, I32:$cond),
(outs), (ins),
[(set I32:$dst, (select I32:$cond, I32:$lhs, I32:$rhs))],
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15 changes: 15 additions & 0 deletions llvm/test/CodeGen/WebAssembly/masked-shifts.ll
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Expand Up @@ -18,6 +18,21 @@ define i32 @shl_i32(i32 %v, i32 %x) {
ret i32 %a
}

define i64 @shl_i64_zext(i64 %v, i32 %x) {
; CHECK-LABEL: shl_i64_zext:
; CHECK: .functype shl_i64_zext (i64, i32) -> (i64)
; CHECK-NEXT: # %bb.0:
; CHECK-NEXT: local.get 0
; CHECK-NEXT: local.get 1
; CHECK-NEXT: i64.extend_i32_u
; CHECK-NEXT: i64.shl
; CHECK-NEXT: # fallthrough-return
%m = and i32 %x, 63
%z = zext i32 %m to i64
%a = shl i64 %v, %z
ret i64 %a
}

define i32 @sra_i32(i32 %v, i32 %x) {
; CHECK-LABEL: sra_i32:
; CHECK: .functype sra_i32 (i32, i32) -> (i32)
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