[PATCH] [X86] Teach how to custom lower double-to-half conversions under fast-math.
Phabricator
reviews at reviews.llvm.org
Mon Feb 23 15:01:24 PST 2015
REPOSITORY
rL LLVM
http://reviews.llvm.org/D7832
Files:
llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
llvm/trunk/test/CodeGen/X86/fastmath-float-half-conversion.ll
Index: llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -3548,6 +3548,21 @@
break;
}
case ISD::FP_TO_FP16: {
+ if (!TM.Options.UseSoftFloat && TM.Options.UnsafeFPMath) {
+ SDValue Op = Node->getOperand(0);
+ MVT SVT = Op.getSimpleValueType();
+ if ((SVT == MVT::f64 || SVT == MVT::f80) &&
+ TLI.isOperationLegalOrCustom(ISD::FP_TO_FP16, MVT::f32)) {
+ // Under fastmath, we can expand this node into a fround followed by
+ // a float-half conversion.
+ SDValue FloatVal = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Op,
+ DAG.getIntPtrConstant(0));
+ Results.push_back(
+ DAG.getNode(ISD::FP_TO_FP16, dl, MVT::i16, FloatVal));
+ break;
+ }
+ }
+
RTLIB::Libcall LC =
RTLIB::getFPROUND(Node->getOperand(0).getValueType(), MVT::f16);
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unable to expand fp_to_fp16");
Index: llvm/trunk/test/CodeGen/X86/fastmath-float-half-conversion.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/fastmath-float-half-conversion.ll
+++ llvm/trunk/test/CodeGen/X86/fastmath-float-half-conversion.ll
@@ -0,0 +1,52 @@
+; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+f16c < %s | FileCheck %s --check-prefix=ALL --check-prefix=F16C
+; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+avx < %s | FileCheck %s --check-prefix=ALL --check-prefix=AVX
+
+define zeroext i16 @test1_fast(double %d) #0 {
+; ALL-LABEL: test1_fast:
+; F16C-NOT: callq {{_+}}truncdfhf2
+; F16C: vcvtsd2ss %xmm0, %xmm0, %xmm0
+; F16C-NEXT: vcvtps2ph $0, %xmm0, %xmm0
+; AVX: callq {{_+}}truncdfhf2
+; ALL: ret
+entry:
+ %0 = tail call i16 @llvm.convert.to.fp16.f64(double %d)
+ ret i16 %0
+}
+
+define zeroext i16 @test2_fast(x86_fp80 %d) #0 {
+; ALL-LABEL: test2_fast:
+; F16C-NOT: callq {{_+}}truncxfhf2
+; F16C: fldt
+; F16C-NEXT: fstps
+; F16C-NEXT: vmovss
+; F16C-NEXT: vcvtps2ph $0, %xmm0, %xmm0
+; AVX: callq {{_+}}truncxfhf2
+; ALL: ret
+entry:
+ %0 = tail call i16 @llvm.convert.to.fp16.f80(x86_fp80 %d)
+ ret i16 %0
+}
+
+define zeroext i16 @test1(double %d) #1 {
+; ALL-LABEL: test1:
+; ALL: callq {{_+}}truncdfhf2
+; ALL: ret
+entry:
+ %0 = tail call i16 @llvm.convert.to.fp16.f64(double %d)
+ ret i16 %0
+}
+
+define zeroext i16 @test2(x86_fp80 %d) #1 {
+; ALL-LABEL: test2:
+; ALL: callq {{_+}}truncxfhf2
+; ALL: ret
+entry:
+ %0 = tail call i16 @llvm.convert.to.fp16.f80(x86_fp80 %d)
+ ret i16 %0
+}
+
+declare i16 @llvm.convert.to.fp16.f64(double)
+declare i16 @llvm.convert.to.fp16.f80(x86_fp80)
+
+attributes #0 = { nounwind readnone uwtable "unsafe-fp-math"="true" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone uwtable "unsafe-fp-math"="false" "use-soft-float"="false" }
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