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llvm-project/llvm/test/CodeGen/PowerPC/tail-dup-analyzable-fallthr...

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Codegen: Don't tail-duplicate blocks with un-analyzable fallthrough. If AnalyzeBranch can't analyze a block and it is possible to fallthrough, then duplicating the block doesn't make sense, as only one block can be the layout predecessor for the un-analyzable fallthrough. Submitted wit a test case, but NOTE: the test case doesn't currently fail. However, the test case fails with D20505 and would have saved me some time debugging. llvm-svn: 278866
2016-08-17 06:56:14 +08:00
; RUN: llc -O2 < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-unknown-linux-gnu"
; Check that the conditional return block of fmax_double3.exit was not
; duplicated into the if.then.i block
; CHECK: # %if.then.i
[PPC] Generate positive FP zero using xor insn instead of loading from constant area https://reviews.llvm.org/D23614 Currently we load +0.0 from constant area. That can change to be generated using XOR instruction. llvm-svn: 284995
2016-10-25 01:31:09 +08:00
; CHECK: xxlxor
Codegen: Don't tail-duplicate blocks with un-analyzable fallthrough. If AnalyzeBranch can't analyze a block and it is possible to fallthrough, then duplicating the block doesn't make sense, as only one block can be the layout predecessor for the un-analyzable fallthrough. Submitted wit a test case, but NOTE: the test case doesn't currently fail. However, the test case fails with D20505 and would have saved me some time debugging. llvm-svn: 278866
2016-08-17 06:56:14 +08:00
; CHECK: stxvd2x
; CHECK-NOT: bclr
; CHECK: {{^}}.LBB{{[0-9_]+}}:
; CHECK-SAME: # %fmax_double3.exit
; CHECK: bclr
; CHECK: # %if.then
; Function Attrs: nounwind
define void @__fmax_double3_3D_exec(<2 x double>* %input6, i1 %bool1, i1 %bool2) #0 {
entry:
br i1 %bool1, label %if.then.i, label %fmax_double3.exit
if.then.i: ; preds = %entry
store <2 x double> zeroinitializer, <2 x double>* %input6, align 32
br label %fmax_double3.exit
fmax_double3.exit: ; preds = %if.then.i, %entry
br i1 %bool2, label %if.then, label %do.end
if.then: ; preds = %fmax_double3.exit
unreachable
do.end: ; preds = %fmax_double3.exit
ret void
}
attributes #0 = { nounwind }