[PATCH] D84649: GlobalISel: Translate llvm.convert.{to|from}.fp16 intrinsics
Matt Arsenault via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 27 05:31:11 PDT 2020
arsenm created this revision.
arsenm added reviewers: aemerson, paquette, aditya_nandakumar, dsanders.
Herald added subscribers: jfb, hiraditya, rovka, wdng.
Herald added a project: LLVM.
I think these were added as a workaround for SelectionDAG lacking half
legalization support in the past. I think they should probably be
removed from the IR, but clang does still have a target control to
emit these instead of the native half fpext/fptrunc.
https://reviews.llvm.org/D84649
Files:
llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-convert-fp16-intrinsics.ll
Index: llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-convert-fp16-intrinsics.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-convert-fp16-intrinsics.ll
@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+; RUN: llc -mtriple=aarch64-- -mcpu=falkor -mattr=+lse -O0 -aarch64-enable-atomic-cfg-tidy=0 -stop-after=irtranslator -global-isel -verify-machineinstrs %s -o - | FileCheck %s
+
+define i16 @convert_to_fp16(float %src) {
+ ; CHECK-LABEL: name: convert_to_fp16
+ ; CHECK: bb.1 (%ir-block.0):
+ ; CHECK: liveins: $s0
+ ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY $s0
+ ; CHECK: [[FPTRUNC:%[0-9]+]]:_(s16) = G_FPTRUNC [[COPY]](s32)
+ ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[FPTRUNC]](s16)
+ ; CHECK: $w0 = COPY [[ANYEXT]](s32)
+ ; CHECK: RET_ReallyLR implicit $w0
+ %cvt = call i16 @llvm.convert.to.fp16.f32(float %src)
+ ret i16 %cvt
+}
+
+define float @convert_from_fp16(i16 %src) {
+ ; CHECK-LABEL: name: convert_from_fp16
+ ; CHECK: bb.1 (%ir-block.0):
+ ; CHECK: liveins: $w0
+ ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY $w0
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[COPY]](s32)
+ ; CHECK: [[FPEXT:%[0-9]+]]:_(s32) = G_FPEXT [[TRUNC]](s16)
+ ; CHECK: $s0 = COPY [[FPEXT]](s32)
+ ; CHECK: RET_ReallyLR implicit $s0
+ %cvt = call float @llvm.convert.from.fp16.f32(i16 %src)
+ ret float %cvt
+}
+
+declare i16 @llvm.convert.to.fp16.f32(float) nounwind readnone
+declare float @llvm.convert.from.fp16.f32(i16) nounwind readnone
Index: llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1543,6 +1543,18 @@
}
return true;
}
+ case Intrinsic::convert_from_fp16:
+ // FIXME: This intrinsic should probably be removed from the IR.
+ MIRBuilder.buildFPExt(getOrCreateVReg(CI),
+ getOrCreateVReg(*CI.getArgOperand(0)),
+ MachineInstr::copyFlagsFromInstruction(CI));
+ return true;
+ case Intrinsic::convert_to_fp16:
+ // FIXME: This intrinsic should probably be removed from the IR.
+ MIRBuilder.buildFPTrunc(getOrCreateVReg(CI),
+ getOrCreateVReg(*CI.getArgOperand(0)),
+ MachineInstr::copyFlagsFromInstruction(CI));
+ return true;
case Intrinsic::memcpy:
case Intrinsic::memmove:
case Intrinsic::memset:
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