1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
; REQUIRES: asserts
; RUN: llc < %s -march=x86 -relocation-model=static -stats 2>&1 | \
; RUN: grep asm-printer | grep 16
;
; It's possible to schedule this in 14 instructions by avoiding
; callee-save registers, but the scheduler isn't currently that
; conervative with registers.
@size20 = external global i32 ; <i32*> [#uses=1]
@in5 = external global i8* ; <i8**> [#uses=1]
define i32 @compare(i8* %a, i8* %b) nounwind {
%tmp = bitcast i8* %a to i32* ; <i32*> [#uses=1]
%tmp1 = bitcast i8* %b to i32* ; <i32*> [#uses=1]
%tmp.upgrd.1 = load i32, i32* @size20 ; <i32> [#uses=1]
%tmp.upgrd.2 = load i8*, i8** @in5 ; <i8*> [#uses=2]
%tmp3 = load i32, i32* %tmp1 ; <i32> [#uses=1]
%gep.upgrd.3 = zext i32 %tmp3 to i64 ; <i64> [#uses=1]
%tmp4 = getelementptr i8, i8* %tmp.upgrd.2, i64 %gep.upgrd.3 ; <i8*> [#uses=2]
%tmp7 = load i32, i32* %tmp ; <i32> [#uses=1]
%gep.upgrd.4 = zext i32 %tmp7 to i64 ; <i64> [#uses=1]
%tmp8 = getelementptr i8, i8* %tmp.upgrd.2, i64 %gep.upgrd.4 ; <i8*> [#uses=2]
%tmp.upgrd.5 = tail call i32 @memcmp( i8* %tmp8, i8* %tmp4, i32 %tmp.upgrd.1 ) ; <i32> [#uses=1]
ret i32 %tmp.upgrd.5
}
declare i32 @memcmp(i8*, i8*, i32)
|
