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[X86] Add addcarry/subborrow combine tests 

Show failure to simplify cases with zero op/flags

llvm-svn: 352196
This commit is contained in:
Simon Pilgrim 2019-01-25 12:26:27 +00:00
parent 759d5e6783
commit d41ccddda9
1 changed files with 74 additions and 0 deletions
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74
llvm/test/CodeGen/X86/combine-adx.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefixes=X64
define i32 @test_addcarry_32_x_0_false(i32 %a0) {
; X86-LABEL: test_addcarry_32_x_0_false:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: addl $0, %eax
; X86-NEXT: retl
;
; X64-LABEL: test_addcarry_32_x_0_false:
; X64: # %bb.0:
; X64-NEXT: # kill: def $edi killed $edi def $rdi
; X64-NEXT: leal (%rdi), %eax
; X64-NEXT: retq
%1 = tail call { i8, i32 } @llvm.x86.addcarry.32(i8 0, i32 %a0, i32 0)
%2 = extractvalue { i8, i32 } %1, 1
ret i32 %2
}
define i32 @test_addcarry_32_0_x_false(i32 %a0) {
; X86-LABEL: test_addcarry_32_0_x_false:
; X86: # %bb.0:
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: addl {{[0-9]+}}(%esp), %eax
; X86-NEXT: retl
;
; X64-LABEL: test_addcarry_32_0_x_false:
; X64: # %bb.0:
; X64-NEXT: # kill: def $edi killed $edi def $rdi
; X64-NEXT: leal (%rdi), %eax
; X64-NEXT: retq
%1 = tail call { i8, i32 } @llvm.x86.addcarry.32(i8 0, i32 0, i32 %a0)
%2 = extractvalue { i8, i32 } %1, 1
ret i32 %2
}
define i32 @test_subborrow_32_x_0_false(i32 %a0) {
; X86-LABEL: test_subborrow_32_x_0_false:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: subl $0, %eax
; X86-NEXT: retl
;
; X64-LABEL: test_subborrow_32_x_0_false:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: subl $0, %eax
; X64-NEXT: retq
%1 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 %a0, i32 0)
%2 = extractvalue { i8, i32 } %1, 1
ret i32 %2
}
define i32 @test_subborrow_32_0_x_false(i32 %a0) {
; X86-LABEL: test_subborrow_32_0_x_false:
; X86: # %bb.0:
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: subl {{[0-9]+}}(%esp), %eax
; X86-NEXT: retl
;
; X64-LABEL: test_subborrow_32_0_x_false:
; X64: # %bb.0:
; X64-NEXT: movl %edi, %eax
; X64-NEXT: negl %eax
; X64-NEXT: retq
%1 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 0, i32 %a0)
%2 = extractvalue { i8, i32 } %1, 1
ret i32 %2
}
declare { i8, i32 } @llvm.x86.addcarry.32(i8, i32, i32)
declare { i8, i32 } @llvm.x86.subborrow.32(i8, i32, i32)