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[WebAssembly] Use the same lowerings for f16x8 as other float vectors. #127897

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Merged
merged 3 commits into from
Feb 25, 2025
Merged

[WebAssembly] Use the same lowerings for f16x8 as other float vectors. #127897

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61bb886
[WebAssembly] Use the same lowerings for f16x8 as other float vectors.
brendandahl Feb 19, 2025
d9472cc
Skip expansion when f16 is enabled.
brendandahl Feb 25, 2025
4bdaadd
fix comment
brendandahl Feb 25, 2025
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10 changes: 4 additions & 6 deletions llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,10 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
setOperationAction(ISD::VACOPY, MVT::Other, Expand);
setOperationAction(ISD::VAEND, MVT::Other, Expand);

for (auto T : {MVT::f32, MVT::f64, MVT::v4f32, MVT::v2f64}) {
for (auto T : {MVT::f32, MVT::f64, MVT::v4f32, MVT::v2f64, MVT::v8f16}) {
if (!Subtarget->hasFP16() && T == MVT::v8f16) {
continue;
}
// Don't expand the floating-point types to constant pools.
setOperationAction(ISD::ConstantFP, T, Legal);
// Expand floating-point comparisons.
Expand All @@ -147,11 +150,6 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
setTruncStoreAction(T, MVT::f16, Expand);
}

if (Subtarget->hasFP16()) {
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This is now covered above in the loop.

setOperationAction(ISD::FMINIMUM, MVT::v8f16, Legal);
setOperationAction(ISD::FMAXIMUM, MVT::v8f16, Legal);
}

// Expand unavailable integer operations.
for (auto Op :
{ISD::BSWAP, ISD::SMUL_LOHI, ISD::UMUL_LOHI, ISD::MULHS, ISD::MULHU,
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10 changes: 10 additions & 0 deletions llvm/test/CodeGen/WebAssembly/half-precision.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,16 @@ define <8 x i1> @compare_oge_v8f16 (<8 x half> %x, <8 x half> %y) {
ret <8 x i1> %res
}

; CHECK-LABEL: compare_ule_v8f16:
; CHECK-NEXT: .functype compare_ule_v8f16 (v128, v128) -> (v128){{$}}
; CHECK-NEXT: f16x8.gt $push[[T0:[0-9]+]]=, $0, $1{{$}}
; CHECK-NEXT: v128.not $push[[R:[0-9]+]]=, $pop[[T0]]{{$}}
; CHECK-NEXT: return $pop[[R]]{{$}}
define <8 x i1> @compare_ule_v8f16 (<8 x half> %x, <8 x half> %y) {
%res = fcmp ule <8 x half> %x, %y
ret <8 x i1> %res
}

; CHECK-LABEL: abs_v8f16:
; CHECK-NEXT: .functype abs_v8f16 (v128) -> (v128)
; CHECK-NEXT: f16x8.abs $push0=, $0
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