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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-02 21:46:39 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-02 21:46:39 +0000 |
| commit | 27cb347d0e765175efb2c4d388bcbba84cf1b95e (patch) | |
| tree | 3941172340fa3c1f5c26af2731534f62c2781064 /test | |
| parent | abe704309f2958f14ba4b59d9be8c9fba72a48c1 (diff) | |
| download | external_llvm-27cb347d0e765175efb2c4d388bcbba84cf1b95e.zip external_llvm-27cb347d0e765175efb2c4d388bcbba84cf1b95e.tar.gz external_llvm-27cb347d0e765175efb2c4d388bcbba84cf1b95e.tar.bz2 | |
Make sure the whole live range is covered when values are pruned twice.
JoinVals::pruneValues() calls LIS->pruneValue() to avoid conflicts when
overlapping two different values. This produces a set of live range end
points that are used to reconstruct the live range (with SSA update)
after joining the two registers.
When a value is pruned twice, the set of end points was insufficient:
v1 = DEF
v1 = REPLACE1
v1 = REPLACE2
KILL v1
The end point at KILL would only reconstruct the live range from
REPLACE2 to KILL, leaving the range REPLACE1-REPLACE2 dead.
Add REPLACE2 as an end point in this case so the full live range is
reconstructed.
This fixes PR13999.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165056 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/ARM/coalesce-subregs.ll | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/test/CodeGen/ARM/coalesce-subregs.ll b/test/CodeGen/ARM/coalesce-subregs.ll index 8d7ded5..6e1f17d 100644 --- a/test/CodeGen/ARM/coalesce-subregs.ll +++ b/test/CodeGen/ARM/coalesce-subregs.ll @@ -1,4 +1,4 @@ -; RUN: llc < %s -mcpu=cortex-a9 -new-coalescer | FileCheck %s +; RUN: llc < %s -mcpu=cortex-a9 -verify-coalescing | FileCheck %s target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32" target triple = "thumbv7-apple-ios0.0.0" @@ -189,3 +189,28 @@ if.end: ; preds = %entry, %if.then declare <4 x float> @llvm.arm.neon.vld1.v4f32(i8*, i32) nounwind readonly declare void @llvm.arm.neon.vst1.v4f32(i8*, <4 x float>, i32) nounwind + +; CHECK: pr13999 +define void @pr13999() nounwind readonly { +entry: + br i1 true, label %outer_loop, label %loop.end + +outer_loop: + %d = phi double [ 0.0, %entry ], [ %add, %after_inner_loop ] + %0 = insertelement <2 x double> <double 0.0, double 0.0>, double %d, i32 0 + br i1 undef, label %after_inner_loop, label %inner_loop + +inner_loop: + br i1 true, label %after_inner_loop, label %inner_loop + +after_inner_loop: + %1 = phi <2 x double> [ %0, %outer_loop ], [ <double 0.0, double 0.0>, +%inner_loop ] + %2 = extractelement <2 x double> %1, i32 1 + %add = fadd double 1.0, %2 + br i1 false, label %loop.end, label %outer_loop + +loop.end: + %d.end = phi double [ 0.0, %entry ], [ %add, %after_inner_loop ] + ret void +} |