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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-02-15 22:03:29 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-02-15 22:03:29 +0000 |
| commit | 8eea48a43da9e861841abe869c5f3215c1f42d27 (patch) | |
| tree | 7ed4d14fc52d51a564db51403cfcf344dd2728f8 /test/CodeGen/X86 | |
| parent | f1b0a345d31ba952e333cf8cc5b039b8ab82857a (diff) | |
| download | external_llvm-8eea48a43da9e861841abe869c5f3215c1f42d27.zip external_llvm-8eea48a43da9e861841abe869c5f3215c1f42d27.tar.gz external_llvm-8eea48a43da9e861841abe869c5f3215c1f42d27.tar.bz2 | |
Fix PR6300.
A virtual register can be used before it is defined in the same MBB if the MBB
is part of a loop. Teach the implicit-def pass about this case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96279 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86')
| -rw-r--r-- | test/CodeGen/X86/2010-02-15-ImplicitDefBug.ll | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2010-02-15-ImplicitDefBug.ll b/test/CodeGen/X86/2010-02-15-ImplicitDefBug.ll new file mode 100644 index 0000000..c429172 --- /dev/null +++ b/test/CodeGen/X86/2010-02-15-ImplicitDefBug.ll @@ -0,0 +1,80 @@ +; RUN: llc < %s > %t +; PR6300 +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" +target triple = "i386-pc-linux-gnu" + +; When the "154" loops back onto itself, it defines a register after using it. +; The first value of the register is implicit-def. + +%"struct location_chain_def" = type { %"struct location_chain_def"*, %"struct rtx_def"*, %"struct rtx_def"*, i32 } +%"struct real_value" = type { i32, [5 x i32] } +%"struct rtx_def" = type { i16, i8, i8, %"union u" } +%"union u" = type { %"struct real_value" } + +define i32 @variable_union(i8** nocapture %slot, i8* nocapture %data) nounwind { +entry: + br i1 undef, label %"4.thread", label %"3" + +"4.thread": ; preds = %entry + unreachable + +"3": ; preds = %entry + br i1 undef, label %"19", label %"20" + +"19": ; preds = %"3" + unreachable + +"20": ; preds = %"3" + br i1 undef, label %"56.preheader", label %dv_onepart_p.exit + +dv_onepart_p.exit: ; preds = %"20" + unreachable + +"56.preheader": ; preds = %"20" + br label %"56" + +"50": ; preds = %"57" + br label %"56" + +"56": ; preds = %"50", %"56.preheader" + br i1 undef, label %"57", label %"58" + +"57": ; preds = %"56" + br i1 undef, label %"50", label %"58" + +"58": ; preds = %"57", %"56" + br i1 undef, label %"62", label %"63" + +"62": ; preds = %"58" + unreachable + +"63": ; preds = %"58" + br i1 undef, label %"67", label %"66" + +"66": ; preds = %"63" + br label %"67" + +"67": ; preds = %"66", %"63" + br label %"68" + +"68": ; preds = %"161", %"67" + br i1 undef, label %"153", label %"161" + +"153": ; preds = %"68" + br i1 undef, label %"160", label %bb.nph46 + +bb.nph46: ; preds = %"153" + br label %"154" + +"154": ; preds = %"154", %bb.nph46 + %0 = phi %"struct location_chain_def"** [ undef, %bb.nph46 ], [ %1, %"154" ] ; <%"struct location_chain_def"**> [#uses=1] + %1 = bitcast i8* undef to %"struct location_chain_def"** ; <%"struct location_chain_def"**> [#uses=1] + store %"struct location_chain_def"* undef, %"struct location_chain_def"** %0, align 4 + br i1 undef, label %"160", label %"154" + +"160": ; preds = %"154", %"153" + br label %"161" + +"161": ; preds = %"160", %"68" + br label %"68" +} |