Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Do not remove implicit defs in BranchFolder
Branch folder removes implicit defs if they are the only non-branching instructions in a block, and the branches do not use the defined registers. The problem is that in some cases these implicit defs are required for the liveness information to be correct. Differential Revision: https://reviews.llvm.org/D25478 llvm-svn: 284036
- Loading branch information
Krzysztof Parzyszek
committed
Oct 12, 2016
1 parent
105a3ce
commit 8271be9
Showing
4 changed files
with
30 additions
and
55 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,29 @@ | ||
; RUN: llc -march=hexagon -verify-machineinstrs < %s | FileCheck %s | ||
; | ||
; Check that the testcase compiles successfully. Expect that if-conversion | ||
; took place. | ||
; CHECK-LABEL: fred: | ||
; CHECK: if (!p0) r1 = memw(r0 + #0) | ||
|
||
target triple = "hexagon" | ||
|
||
define void @fred(i32 %p0) local_unnamed_addr align 2 { | ||
b0: | ||
br i1 undef, label %b1, label %b2 | ||
|
||
b1: ; preds = %b0 | ||
%t0 = load i8*, i8** undef, align 4 | ||
br label %b2 | ||
|
||
b2: ; preds = %b1, %b0 | ||
%t1 = phi i8* [ %t0, %b1 ], [ undef, %b0 ] | ||
%t2 = getelementptr inbounds i8, i8* %t1, i32 %p0 | ||
tail call void @llvm.memmove.p0i8.p0i8.i32(i8* undef, i8* %t2, i32 undef, i32 1, i1 false) #1 | ||
unreachable | ||
} | ||
|
||
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i32, i1) #0 | ||
|
||
attributes #0 = { argmemonly nounwind } | ||
attributes #1 = { nounwind } | ||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters