6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-11-23 16:19:52 +00:00
Code Issues Projects Releases Wiki Activity

IndVarSimplify: Allow LFTR to fire more often

Browse Source 
I added a pessimization in r217102 to prevent miscompiles when the
incremented induction variable was used in a comparison; it would be
poison.

Try to use the incremented induction variable more often when we can be
sure that the increment won't end in poison.

Differential Revision: http://reviews.llvm.org/D6222

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222213 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-11-18 02:20:58 +00:00
parent 5d8a792eac
commit 1ade0f0faa
2 changed files with 23 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
test/Transforms/IndVarSimplify/lftr-extend-const.ll
View File

@@ -2,7 +2,7 @@
; CHECK-LABEL: @foo(
; CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16
; CHECK: %exitcond = icmp ne i32 %indvars.iv, 511
; CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512
define void @foo() #0 {
entry:
br label %for.body