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; RUN: opt < %s -instcombine -S -o - | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
; CHECK-LABEL: define float @func1(
define float @func1(float %a, float %b, float %c, i1 %cond) {
entry:
br i1 %cond, label %cond.true, label %cond.false
cond.true:
%sub0 = fsub fast float %a, %b
br label %cond.end
cond.false:
%sub1 = fsub fast float %a, %c
br label %cond.end
; The fast-math flags should always be transfered if possible.
; CHECK-LABEL: cond.end
; CHECK [[PHI:%[^ ]*]] = phi float [ %b, %cond.true ], [ %c, %cond.false ]
; CHECK fsub fast float %a, [[PHI]]
cond.end:
%e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ]
ret float %e
}
; CHECK-LABEL: define float @func2(
define float @func2(float %a, float %b, float %c, i1 %cond) {
entry:
br i1 %cond, label %cond.true, label %cond.false
cond.true:
%sub0 = fsub fast float %a, %b
br label %cond.end
cond.false:
%sub1 = fsub float %a, %c
br label %cond.end
; The fast-math flags should always be transfered if possible.
; CHECK-LABEL: cond.end
; CHECK [[PHI:%[^ ]*]] = phi float [ %b, %cond.true ], [ %c, %cond.false ]
; CHECK fsub float %a, [[PHI]]
cond.end:
%e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ]
ret float %e
}
; CHECK-LABEL: define float @func3(
define float @func3(float %a, float %b, float %c, i1 %cond) {
entry:
br i1 %cond, label %cond.true, label %cond.false
cond.true:
%sub0 = fsub fast float %a, 2.0
br label %cond.end
cond.false:
%sub1 = fsub fast float %b, 2.0
br label %cond.end
; CHECK-LABEL: cond.end
; CHECK [[PHI:%[^ ]*]] = phi float [ %a, %cond.true ], [ %b, %cond.false ]
; CHECK fadd fast float %a, [[PHI]]
cond.end:
%e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ]
ret float %e
}
; CHECK-LABEL: define float @func4(
define float @func4(float %a, float %b, float %c, i1 %cond) {
entry:
br i1 %cond, label %cond.true, label %cond.false
cond.true:
%sub0 = fsub fast float %a, 2.0
br label %cond.end
cond.false:
%sub1 = fsub float %b, 2.0
br label %cond.end
; CHECK-LABEL: cond.end
; CHECK [[PHI:%[^ ]*]] = phi float [ %a, %cond.true ], [ %b, %cond.false ]
; CHECK fadd float %a, [[PHI]]
cond.end:
%e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ]
ret float %e
}
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