mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
5f4e6e1ec0
Optimize the select instructions sequence to use the EFLAGS directly from a compare when possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211543 91177308-0d34-0410-b5e6-96231b3b80d8
17 lines
637 B
LLVM
17 lines
637 B
LLVM
; RUN: llc -mtriple x86_64-apple-darwin -O0 -o - < %s | FileCheck %s
|
|
; Make sure we only use the less significant bit of the value that feeds the
|
|
; select. Otherwise, we may account for a non-zero value whereas the
|
|
; lsb is zero.
|
|
; <rdar://problem/15651765>
|
|
|
|
; CHECK-LABEL: fastisel_select:
|
|
; CHECK: subb {{%[a-z0-9]+}}, [[RES:%[a-z0-9]+]]
|
|
; CHECK: testb $1, [[RES]]
|
|
; CHECK: cmovnel %edi, %esi
|
|
define i32 @fastisel_select(i1 %exchSub2211_, i1 %trunc_8766) {
|
|
%shuffleInternal15257_8932 = sub i1 %exchSub2211_, %trunc_8766
|
|
%counter_diff1345 = select i1 %shuffleInternal15257_8932, i32 1204476887, i32 0
|
|
ret i32 %counter_diff1345
|
|
}
|
|
|