select-2.ll
777 Bytes
; RUN: opt < %s -instcombine -S | FileCheck %s
; CHECK: select
; CHECK: select
; Make sure instcombine don't fold select into operands. We don't want to emit
; select of two integers unless it's selecting 0 / 1.
define i32 @t1(i32 %c, i32 %x) nounwind {
%t1 = icmp eq i32 %c, 0
%t2 = lshr i32 %x, 18
%t3 = select i1 %t1, i32 %t2, i32 %x
ret i32 %t3
}
define i32 @t2(i32 %c, i32 %x) nounwind {
%t1 = icmp eq i32 %c, 0
%t2 = and i32 %x, 18
%t3 = select i1 %t1, i32 %t2, i32 %x
ret i32 %t3
}
define float @t3(float %x, float %y) nounwind {
%t1 = fcmp ogt float %x, %y
%t2 = select i1 %t1, float %x, float 1.0
%t3 = fadd fast float %t2, 1.0
ret float %t3
; CHECK-LABEL: @t3(
; CHECK: fadd fast
; CHECK: select
}