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[WebAssembly] Configure codegen to legalize f16 values.

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llvm-svn: 295850
This commit is contained in:
Dan Gohman 2017-02-22 16:28:00 +00:00
parent 2628d17171
commit c1dd7eac65
2 changed files with 33 additions and 0 deletions
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5
lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
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@ -95,6 +95,11 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
// Support minnan and maxnan, which otherwise default to expand.
setOperationAction(ISD::FMINNAN, T, Legal);
setOperationAction(ISD::FMAXNAN, T, Legal);
// WebAssembly currently has no builtin f16 support.
setOperationAction(ISD::FP16_TO_FP, T, Expand);
setOperationAction(ISD::FP_TO_FP16, T, Expand);
setLoadExtAction(ISD::EXTLOAD, T, MVT::f16, Expand);
setTruncStoreAction(T, MVT::f16, Expand);
}
for (auto T : {MVT::i32, MVT::i64}) {

28
test/CodeGen/WebAssembly/f16.ll Normal file
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@ -0,0 +1,28 @@
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt | FileCheck %s
; Test that f16 is expanded.
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
; CHECK-LABEL: demote:
; CHECK-NEXT: .param f32{{$}}
; CHECK-NEXT: .result f32{{$}}
; CHECK-NEXT: get_local $push[[L0:[0-9]+]]=, 0{{$}}
; CHECK-NEXT: i32.call $push[[L1:[0-9]+]]=, __gnu_f2h_ieee@FUNCTION, $pop[[L0]]{{$}}
; CHECK-NEXT: f32.call $push[[L2:[0-9]+]]=, __gnu_h2f_ieee@FUNCTION, $pop[[L1]]{{$}}
; CHECK-NEXT: return $pop[[L2]]{{$}}
define half @demote(float %f) {
%t = fptrunc float %f to half
ret half %t
}
; CHECK-LABEL: promote:
; CHECK-NEXT: .param f32{{$}}
; CHECK-NEXT: .result f32{{$}}
; CHECK-NEXT: get_local $push0=, 0{{$}}
; CHECK-NEXT: return $pop0{{$}}
define float @promote(half %f) {
%t = fpext half %f to float
ret float %t
}