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[SOL] Expand mulh for 32-bit #127

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Jan 16, 2025
Merged

[SOL] Expand mulh for 32-bit #127

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5 changes: 5 additions & 0 deletions llvm/lib/Target/SBF/SBFISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,11 @@ SBFTargetLowering::SBFTargetLowering(const TargetMachine &TM,
setOperationAction(ISD::SELECT_CC, VT, Custom);
}

if (STI.getHasPqrClass() && STI.getHasAlu32()) {
setOperationAction(ISD::MULHU, MVT::i32, Expand);
setOperationAction(ISD::MULHS, MVT::i32, Expand);
}

if (STI.getHasAlu32()) {
setOperationAction(ISD::BSWAP, MVT::i32, Promote);
setOperationAction(ISD::BR_CC, MVT::i32, Custom);
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62 changes: 62 additions & 0 deletions llvm/test/CodeGen/SBF/mulh.ll
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@@ -0,0 +1,62 @@
; RUN: llc -O2 -march=sbf -mcpu=v2 < %s | FileCheck %s

define dso_local i32 @test_32_unsigned(i32 noundef %a, i32 noundef %b) {
entry:
; CHECK-LABEL: test_32_unsigned
%conv = zext i32 %a to i64
%conv1 = zext i32 %b to i64
%mul = mul nuw i64 %conv1, %conv
%shr = lshr i64 %mul, 32
%conv2 = trunc i64 %shr to i32
ret i32 %conv2

; CHECK: mov64 w0, w2
; CHECK: lmul64 r0, r1
; CHECK: rsh64 r0, 32
; CHECK: and32 w0, -1
}

define dso_local i32 @test_32_signed(i32 noundef %a, i32 noundef %b) {
entry:

; CHECK-LABEL: test_32_signed
%conv = sext i32 %a to i64
%conv1 = sext i32 %b to i64
%mul = mul nsw i64 %conv1, %conv
%shr = lshr i64 %mul, 32
%conv2 = trunc i64 %shr to i32
ret i32 %conv2

; CHECK: mov32 r1, w1
; CHECK: mov32 r0, w2
; CHECK: lmul64 r0, r1
; CHECK: rsh64 r0, 32
; CHECK: and32 w0, -1

}

define dso_local i64 @test_64_unsigned(i64 noundef %a, i64 noundef %b) {
entry:
; CHECK-LABEL: test_64_unsigned
%conv = zext i64 %a to i128
%conv1 = zext i64 %b to i128
%mul = mul nuw i128 %conv1, %conv
%shr = lshr i128 %mul, 64
%conv2 = trunc i128 %shr to i64
ret i64 %conv2

; CHECK: uhmul64 r0, r1
}

define dso_local i64 @test_64_signed(i64 noundef %a, i64 noundef %b) {
entry:
; CHECK-LABEL: test_64_signed
%conv = sext i64 %a to i128
%conv1 = sext i64 %b to i128
%mul = mul nsw i128 %conv1, %conv
%shr = lshr i128 %mul, 64
%conv2 = trunc i128 %shr to i64
ret i64 %conv2

; CHECK: shmul64 r0, r1
}
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