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[WebAssembly] Call signExtend to get sign extended register 

Patch by Jatin Bhateja!

Differential Revision: https://reviews.llvm.org/D39529

llvm-svn: 317710
This commit is contained in:
Dan Gohman 2017-11-08 19:24:21 +00:00
parent a3efbb0836
commit 0828ba1e1e
2 changed files with 23 additions and 1 deletions
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2
llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp
View File

@ -541,7 +541,7 @@ unsigned WebAssemblyFastISel::getRegForUnsignedValue(const Value *V) {
unsigned WebAssemblyFastISel::getRegForSignedValue(const Value *V) {
MVT::SimpleValueType From = getSimpleType(V->getType());
MVT::SimpleValueType To = getLegalType(From);
return zeroExtend(getRegForValue(V), V, From, To);
return signExtend(getRegForValue(V), V, From, To);
}
unsigned WebAssemblyFastISel::getRegForPromotedValue(const Value *V,

22
llvm/test/CodeGen/WebAssembly/signext-arg.ll Normal file
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@ -0,0 +1,22 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -march=wasm32 | FileCheck %s
declare i32 @get_int(i16 %arg)
define i32 @func_1(i16 %arg1 , i32 %arg2) #0 {
; CHECK-LABEL: func_1:
; CHECK: # BB#0: # %entry
; CHECK-NEXT: i32.const $push1=, 16
; CHECK-NEXT: i32.shl $push2=, $0, $pop1
; CHECK-NEXT: i32.const $push4=, 16
; CHECK-NEXT: i32.shr_s $push3=, $pop2, $pop4
; CHECK-NEXT: i32.call $push0=, get_int@FUNCTION, $pop3
; CHECK-NEXT: # fallthrough-return: $pop0
; CHECK-NEXT: .endfunc
entry:
%retval = call i32 @get_int(i16 signext %arg1)
ret i32 %retval
}
attributes #0 = {noinline nounwind optnone}