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llvm-project/llvm/test/CodeGen/X86/sitofp.ll

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[X86] Replace action Promote with Expand for operation ISD::SINT_TO_FP Summary: If attribute "use-soft-float"="true" is set then X86ISelLowering.cpp sets 'Promote' action for ISD::SINT_TO_FP operation on type i32. But 'Promote' action is not proper in this case since lib function __floatsidf is available for casting from signed int to float type. Thus Expand action is more suitable here. The Expand action should be set for ISD::UINT_TO_FP for soft float as well. If function attribute "use-soft-float"="true" is set then infinite looping can happen in DAG combining, function visitSINT_TO_FP() replaces SINT_TO_FP node with UINT_TO_FP node and function combineUIntToFP() replace vice versa in cycle. The fix prevents it. Patch by vrybalov Differential Revision: https://reviews.llvm.org/D45572 llvm-svn: 330711
2018-04-24 20:57:51 +08:00
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
[X86] Fix missing cfi from sitofp checks llvm-svn: 330715
2018-04-24 21:24:56 +08:00
; RUN: llc < %s -mtriple=i386-unknown-linux-gnu | FileCheck %s
[X86] Replace action Promote with Expand for operation ISD::SINT_TO_FP Summary: If attribute "use-soft-float"="true" is set then X86ISelLowering.cpp sets 'Promote' action for ISD::SINT_TO_FP operation on type i32. But 'Promote' action is not proper in this case since lib function __floatsidf is available for casting from signed int to float type. Thus Expand action is more suitable here. The Expand action should be set for ISD::UINT_TO_FP for soft float as well. If function attribute "use-soft-float"="true" is set then infinite looping can happen in DAG combining, function visitSINT_TO_FP() replaces SINT_TO_FP node with UINT_TO_FP node and function combineUIntToFP() replace vice versa in cycle. The fix prevents it. Patch by vrybalov Differential Revision: https://reviews.llvm.org/D45572 llvm-svn: 330711
2018-04-24 20:57:51 +08:00
define double @foo(i16 %a) #0 {
; CHECK-LABEL: foo:
; CHECK: # %bb.0:
; CHECK-NEXT: subl $12, %esp
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT: movl %eax, (%esp)
; CHECK-NEXT: calll __floatsidf
; CHECK-NEXT: addl $12, %esp
[X86] Fix missing cfi from sitofp checks llvm-svn: 330715
2018-04-24 21:24:56 +08:00
; CHECK-NEXT: .cfi_def_cfa_offset 4
[X86] Replace action Promote with Expand for operation ISD::SINT_TO_FP Summary: If attribute "use-soft-float"="true" is set then X86ISelLowering.cpp sets 'Promote' action for ISD::SINT_TO_FP operation on type i32. But 'Promote' action is not proper in this case since lib function __floatsidf is available for casting from signed int to float type. Thus Expand action is more suitable here. The Expand action should be set for ISD::UINT_TO_FP for soft float as well. If function attribute "use-soft-float"="true" is set then infinite looping can happen in DAG combining, function visitSINT_TO_FP() replaces SINT_TO_FP node with UINT_TO_FP node and function combineUIntToFP() replace vice versa in cycle. The fix prevents it. Patch by vrybalov Differential Revision: https://reviews.llvm.org/D45572 llvm-svn: 330711
2018-04-24 20:57:51 +08:00
; CHECK-NEXT: retl
%conv = zext i16 %a to i32
%conv1 = sitofp i32 %conv to double
ret double %conv1
}
attributes #0 = { "use-soft-float"="true" }