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llvm-project/llvm/test/CodeGen/X86/br-fold.ll

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Fix a codegen abort seen in 483.xalancbmk. llvm-svn: 93417
2010-01-14 11:08:49 +08:00
; RUN: llc -march=x86-64 < %s | FileCheck %s
; CHECK: orq
Fix updateTerminator to be resiliant to degenerate terminators where both fallthrough and a conditional branch target the same successor. Gracefully delete the conditional branch and introduce any unconditional branch needed to reach the actual successor. This fixes memory corruption in 2009-06-15-RegScavengerAssert.ll and possibly other tests. Also, while I'm here fix a latent bug I spotted by inspection. I never applied the same fundamental fix to this fallthrough successor finding logic that I did to the logic used when there are no conditional branches. As a consequence it would have selected landing pads had they be aligned in just the right way here. I don't have a test case as I spotted this by inspection, and the previous time I found this required have of TableGen's source code to produce it. =/ I hate backend bugs. ;] Thanks to Jim Grosbach for helping me reason through this and reviewing the fix. llvm-svn: 154867
2012-04-17 06:03:00 +08:00
; CHECK-NEXT: .LBB0_1
Fix a codegen abort seen in 483.xalancbmk. llvm-svn: 93417
2010-01-14 11:08:49 +08:00
@_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE = external constant [33 x i16], align 32 ; <[33 x i16]*> [#uses=1]
@_ZN11xercesc_2_56XMLUni16fgNotationStringE = external constant [9 x i16], align 16 ; <[9 x i16]*> [#uses=1]
define fastcc void @foo() {
entry:
br i1 icmp eq (i64 or (i64 ptrtoint ([33 x i16]* @_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE to i64),
i64 ptrtoint ([9 x i16]* @_ZN11xercesc_2_56XMLUni16fgNotationStringE to i64)), i64 0),
label %bb8.i329, label %bb4.i.i318.preheader
bb4.i.i318.preheader: ; preds = %bb6
unreachable
bb8.i329: ; preds = %bb6
unreachable
}