You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
1.7 KiB
84 lines
1.7 KiB
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
; CHECK-LABEL: @sub1(
|
|
; CHECK: %y = sub i32 0, %x
|
|
; CHECK: %z = sdiv i32 %y, 337
|
|
; CHECK: ret i32 %z
|
|
define i32 @sub1(i32 %x) {
|
|
%y = sub i32 0, %x
|
|
%z = sdiv i32 %y, 337
|
|
ret i32 %z
|
|
}
|
|
|
|
; CHECK-LABEL: @sub2(
|
|
; CHECK: %z = sdiv i32 %x, -337
|
|
; CHECK: ret i32 %z
|
|
define i32 @sub2(i32 %x) {
|
|
%y = sub nsw i32 0, %x
|
|
%z = sdiv i32 %y, 337
|
|
ret i32 %z
|
|
}
|
|
|
|
; CHECK-LABEL: @shl_icmp(
|
|
; CHECK: %B = icmp eq i64 %X, 0
|
|
; CHECK: ret i1 %B
|
|
define i1 @shl_icmp(i64 %X) nounwind {
|
|
%A = shl nuw i64 %X, 2 ; X/4
|
|
%B = icmp eq i64 %A, 0
|
|
ret i1 %B
|
|
}
|
|
|
|
; CHECK-LABEL: @shl1(
|
|
; CHECK: %B = shl nuw nsw i64 %A, 8
|
|
; CHECK: ret i64 %B
|
|
define i64 @shl1(i64 %X, i64* %P) nounwind {
|
|
%A = and i64 %X, 312
|
|
store i64 %A, i64* %P ; multiple uses of A.
|
|
%B = shl i64 %A, 8
|
|
ret i64 %B
|
|
}
|
|
|
|
; CHECK-LABEL: @preserve1(
|
|
; CHECK: add nsw i32 %x, 5
|
|
define i32 @preserve1(i32 %x) nounwind {
|
|
%add = add nsw i32 %x, 2
|
|
%add3 = add nsw i32 %add, 3
|
|
ret i32 %add3
|
|
}
|
|
|
|
; CHECK-LABEL: @nopreserve1(
|
|
; CHECK: add i8 %x, -126
|
|
define i8 @nopreserve1(i8 %x) nounwind {
|
|
%add = add nsw i8 %x, 127
|
|
%add3 = add nsw i8 %add, 3
|
|
ret i8 %add3
|
|
}
|
|
|
|
; CHECK-LABEL: @nopreserve2(
|
|
; CHECK: add i8 %x, 3
|
|
define i8 @nopreserve2(i8 %x) nounwind {
|
|
%add = add i8 %x, 1
|
|
%add3 = add nsw i8 %add, 2
|
|
ret i8 %add3
|
|
}
|
|
|
|
; CHECK-LABEL: @nopreserve3(
|
|
; CHECK: add i8 %A, %B
|
|
; CHECK: add i8
|
|
define i8 @nopreserve3(i8 %A, i8 %B) nounwind {
|
|
%x = add i8 %A, 10
|
|
%y = add i8 %B, 10
|
|
%add = add nsw i8 %x, %y
|
|
ret i8 %add
|
|
}
|
|
|
|
; CHECK-LABEL: @nopreserve4(
|
|
; CHECK: add i8 %A, %B
|
|
; CHECK: add i8
|
|
define i8 @nopreserve4(i8 %A, i8 %B) nounwind {
|
|
%x = add nsw i8 %A, 10
|
|
%y = add nsw i8 %B, 10
|
|
%add = add nsw i8 %x, %y
|
|
ret i8 %add
|
|
}
|