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; RUN: opt -S < %s -gvn | FileCheck %s
declare void @llvm.sideeffect()
; Store-to-load forwarding across a @llvm.sideeffect.
; CHECK-LABEL: s2l
; CHECK-NOT: load
define float @s2l(float* %p) {
store float 0.0, float* %p
call void @llvm.sideeffect()
%t = load float, float* %p
ret float %t
}
; Redundant load elimination across a @llvm.sideeffect.
; CHECK-LABEL: rle
; CHECK: load
; CHECK-NOT: load
define float @rle(float* %p) {
%r = load float, float* %p
call void @llvm.sideeffect()
%s = load float, float* %p
%t = fadd float %r, %s
ret float %t
}
; LICM across a @llvm.sideeffect.
; CHECK-LABEL: licm
; CHECK: load
; CHECK: loop:
; CHECK-NOT: load
define float @licm(i64 %n, float* nocapture readonly %p) #0 {
bb0:
br label %loop
loop:
%i = phi i64 [ 0, %bb0 ], [ %t5, %loop ]
%sum = phi float [ 0.000000e+00, %bb0 ], [ %t4, %loop ]
call void @llvm.sideeffect()
%t3 = load float, float* %p
%t4 = fadd float %sum, %t3
%t5 = add i64 %i, 1
%t6 = icmp ult i64 %t5, %n
br i1 %t6, label %loop, label %bb2
bb2:
ret float %t4
}
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