; RUN: opt -S -instcombine < %s | FileCheck %s
target triple = "x86_64-apple-macosx10.6.6"
-define zeroext i16 @foo(i32 %on_off, i16* %puls) nounwind uwtable ssp {
+define zeroext i16 @foo1(i32 %on_off) nounwind uwtable ssp {
entry:
%on_off.addr = alloca i32, align 4
- %puls.addr = alloca i16*, align 8
%a = alloca i32, align 4
store i32 %on_off, i32* %on_off.addr, align 4
- store i16* %puls, i16** %puls.addr, align 8
%tmp = load i32* %on_off.addr, align 4
-; CHECK-NOT: sub
-; CHECK-NOT: mul
-; (1 - %tmp) * (-2) -> (%tmp - 1) * 2
%sub = sub i32 1, %tmp
+; CHECK-NOT: mul i32
%mul = mul i32 %sub, -2
; CHECK: shl
; CHECK-NEXT: add
%conv = trunc i32 %tmp1 to i16
ret i16 %conv
}
+
+define zeroext i16 @foo2(i32 %on_off, i32 %q) nounwind uwtable ssp {
+entry:
+ %on_off.addr = alloca i32, align 4
+ %q.addr = alloca i32, align 4
+ %a = alloca i32, align 4
+ store i32 %on_off, i32* %on_off.addr, align 4
+ store i32 %q, i32* %q.addr, align 4
+ %tmp = load i32* %q.addr, align 4
+ %tmp1 = load i32* %on_off.addr, align 4
+ %sub = sub i32 %tmp, %tmp1
+; CHECK-NOT: mul i32
+ %mul = mul i32 %sub, -4
+; CHECK: sub i32
+; CHECK-NEXT: shl
+ store i32 %mul, i32* %a, align 4
+ %tmp2 = load i32* %a, align 4
+ %conv = trunc i32 %tmp2 to i16
+ ret i16 %conv
+}
+
+define zeroext i16 @foo3(i32 %on_off) nounwind uwtable ssp {
+entry:
+ %on_off.addr = alloca i32, align 4
+ %a = alloca i32, align 4
+ store i32 %on_off, i32* %on_off.addr, align 4
+ %tmp = load i32* %on_off.addr, align 4
+ %sub = sub i32 7, %tmp
+; CHECK-NOT: mul i32
+ %mul = mul i32 %sub, -4
+; CHECK: shl
+; CHECK-NEXT: add
+ store i32 %mul, i32* %a, align 4
+ %tmp1 = load i32* %a, align 4
+ %conv = trunc i32 %tmp1 to i16
+ ret i16 %conv
+}