llvm-6502/test/Transforms/InstCombine/select-crash.ll
Nuno Lopes 75564e3514 fix infinite loop in instcombine in the presence of a (malformed) self-referencing select inst.
This can happen as long as the instruction is not reachable. Instcombine does generate these unreachable malformed selects when doing RAUW

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160874 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-27 18:03:57 +00:00

50 lines
1.5 KiB
LLVM

; RUN: opt < %s -instcombine -S | FileCheck %s
; Formerly crashed, PR8490.
define fastcc double @gimp_operation_color_balance_map(float %value, double %highlights) nounwind readnone inlinehint {
entry:
; CHECK: gimp_operation_color_balance_map
; CHECK: fsub double -0.000000
%conv = fpext float %value to double
%div = fdiv double %conv, 1.600000e+01
%add = fadd double %div, 1.000000e+00
%div1 = fdiv double 1.000000e+00, %add
%sub = fsub double 1.075000e+00, %div1
%sub24 = fsub double 1.000000e+00, %sub
%add26 = fadd double %sub, 1.000000e+00
%cmp86 = fcmp ogt double %highlights, 0.000000e+00
%cond90 = select i1 %cmp86, double %sub24, double %add26
%mul91 = fmul double %highlights, %cond90
%add94 = fadd double undef, %mul91
ret double %add94
}
; PR10180: same crash, but with vectors
define <4 x float> @foo(i1 %b, <4 x float> %x, <4 x float> %y, <4 x float> %z) {
; CHECK: @foo
; CHECK: fsub <4 x float>
; CHECK: select
; CHECK: fadd <4 x float>
%a = fadd <4 x float> %x, %y
%sub = fsub <4 x float> %x, %z
%sel = select i1 %b, <4 x float> %a, <4 x float> %sub
ret <4 x float> %sel
}
; CHECK: @test3
define i32 @test3(i1 %bool, i32 %a) {
entry:
%cond = or i1 %bool, true
br i1 %cond, label %return, label %xpto
; technically reachable, but this malformed IR may appear as a result of constant propagation
xpto:
%select = select i1 %bool, i32 %a, i32 %select
%select2 = select i1 %bool, i32 %select2, i32 %a
%sum = add i32 %select, %select2
ret i32 %sum
return:
ret i32 7
}