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R600: Fix a crash in the AMDILCFGStrucurizer

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The ifPatternMatch() function was not correctly reporting the number
of matches in some cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195030 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2013-11-18 19:43:38 +00:00
parent ef37e453c4
commit 44248e0f63
2 changed files with 69 additions and 6 deletions
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13
lib/Target/R600/AMDILCFGStructurizer.cpp
View File

@ -1005,13 +1005,14 @@ int AMDGPUCFGStructurizer::ifPatternMatch(MachineBasicBlock *MBB) {
return 0; return 0;
assert(isCondBranch(BranchMI)); assert(isCondBranch(BranchMI));
int NumMatch = 0;
MachineBasicBlock *TrueMBB = getTrueBranch(BranchMI); MachineBasicBlock *TrueMBB = getTrueBranch(BranchMI);
serialPatternMatch(TrueMBB); NumMatch += serialPatternMatch(TrueMBB);
ifPatternMatch(TrueMBB); NumMatch += ifPatternMatch(TrueMBB);
MachineBasicBlock *FalseMBB = getFalseBranch(MBB, BranchMI); MachineBasicBlock *FalseMBB = getFalseBranch(MBB, BranchMI);
serialPatternMatch(FalseMBB); NumMatch += serialPatternMatch(FalseMBB);
ifPatternMatch(FalseMBB); NumMatch += ifPatternMatch(FalseMBB);
MachineBasicBlock *LandBlk; MachineBasicBlock *LandBlk;
int Cloned = 0; int Cloned = 0;
@ -1040,7 +1041,7 @@ int AMDGPUCFGStructurizer::ifPatternMatch(MachineBasicBlock *MBB) {
&& isSameloopDetachedContbreak(FalseMBB, TrueMBB)) { && isSameloopDetachedContbreak(FalseMBB, TrueMBB)) {
LandBlk = *TrueMBB->succ_begin(); LandBlk = *TrueMBB->succ_begin();
} else { } else {
return handleJumpintoIf(MBB, TrueMBB, FalseMBB); return NumMatch + handleJumpintoIf(MBB, TrueMBB, FalseMBB);
} }
// improveSimpleJumpinfoIf can handle the case where landBlk == NULL but the // improveSimpleJumpinfoIf can handle the case where landBlk == NULL but the
@ -1068,7 +1069,7 @@ int AMDGPUCFGStructurizer::ifPatternMatch(MachineBasicBlock *MBB) {
numClonedBlock += Cloned; numClonedBlock += Cloned;
return 1 + Cloned; return 1 + Cloned + NumMatch;
} }
int AMDGPUCFGStructurizer::loopendPatternMatch() { int AMDGPUCFGStructurizer::loopendPatternMatch() {

62
test/CodeGen/R600/structurize1.ll Normal file
View File

@ -0,0 +1,62 @@
; RUN: llc < %s -march=r600 -mattr=disable-ifcvt -mcpu=redwood | FileCheck %s
; This tests for abug where the AMDILCFGStructurizer was crashing on loops
; like this:
;
; for (i = 0; i < x; i++) {
; if (cond0) {
; if (cond1) {
;
; } else {
;
; }
; if (cond2) {
;
; }
; }
; }
; CHECK-LABEL: @if_inside_loop
; CHECK: LOOP_START_DX10
; CHECK: END_LOOP
define void @if_inside_loop(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c, i32 %d) {
entry:
br label %for.body
for.body:
%0 = phi i32 [0, %entry], [%inc, %for.inc]
%val = phi i32 [0, %entry], [%val.for.inc, %for.inc]
%inc = add i32 %0, 1
%1 = icmp ult i32 10, %a
br i1 %1, label %for.inc, label %if.then
if.then:
%2 = icmp ne i32 0, %b
br i1 %2, label %if.then.true, label %if.then.false
if.then.true:
%3 = add i32 %a, %val
br label %if
if.then.false:
%4 = mul i32 %a, %val
br label %if
if:
%val.if = phi i32 [%3, %if.then.true], [%4, %if.then.false]
%5 = icmp ne i32 0, %c
br i1 %5, label %if.true, label %for.inc
if.true:
%6 = add i32 %a, %val.if
br label %for.inc
for.inc:
%val.for.inc = phi i32 [%val, %for.body], [%val.if, %if], [%6, %if.true]
%7 = icmp ne i32 0, %d
br i1 %7, label %for.body, label %exit
exit:
store i32 %val.for.inc, i32 addrspace(1)* %out
ret void
}