| Stephen Hines | 36b5688 | 2014-04-23 16:57:46 -0700 | [diff] [blame] | 1 | ; RUN: llc -O3 < %s | FileCheck %s |
| 2 | target triple = "arm64-apple-ios" |
| 3 | |
| 4 | ; rdar://12462006 |
| 5 | ; CSE between "icmp reg reg" and "sub reg reg". |
| 6 | ; Both can be in the same basic block or in different basic blocks. |
| 7 | define i8* @t1(i8* %base, i32* nocapture %offset, i32 %size) nounwind { |
| 8 | entry: |
| 9 | ; CHECK-LABEL: t1: |
| 10 | ; CHECK: subs |
| 11 | ; CHECK-NOT: cmp |
| 12 | ; CHECK-NOT: sub |
| 13 | ; CHECK: b.ge |
| 14 | ; CHECK: sub |
| 15 | ; CHECK: sub |
| 16 | ; CHECK_NOT: sub |
| 17 | ; CHECK: ret |
| 18 | %0 = load i32* %offset, align 4 |
| 19 | %cmp = icmp slt i32 %0, %size |
| 20 | %s = sub nsw i32 %0, %size |
| 21 | br i1 %cmp, label %return, label %if.end |
| 22 | |
| 23 | if.end: |
| 24 | %sub = sub nsw i32 %0, %size |
| 25 | %s2 = sub nsw i32 %s, %size |
| 26 | %s3 = sub nsw i32 %sub, %s2 |
| 27 | store i32 %s3, i32* %offset, align 4 |
| 28 | %add.ptr = getelementptr inbounds i8* %base, i32 %sub |
| 29 | br label %return |
| 30 | |
| 31 | return: |
| 32 | %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ] |
| 33 | ret i8* %retval.0 |
| 34 | } |
| 35 | |
| 36 | ; CSE between "icmp reg imm" and "sub reg imm". |
| 37 | define i8* @t2(i8* %base, i32* nocapture %offset) nounwind { |
| 38 | entry: |
| 39 | ; CHECK-LABEL: t2: |
| 40 | ; CHECK: subs |
| 41 | ; CHECK-NOT: cmp |
| 42 | ; CHECK-NOT: sub |
| 43 | ; CHECK: b.lt |
| 44 | ; CHECK-NOT: sub |
| 45 | ; CHECK: ret |
| 46 | %0 = load i32* %offset, align 4 |
| 47 | %cmp = icmp slt i32 %0, 1 |
| 48 | br i1 %cmp, label %return, label %if.end |
| 49 | |
| 50 | if.end: |
| 51 | %sub = sub nsw i32 %0, 1 |
| 52 | store i32 %sub, i32* %offset, align 4 |
| 53 | %add.ptr = getelementptr inbounds i8* %base, i32 %sub |
| 54 | br label %return |
| 55 | |
| 56 | return: |
| 57 | %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ] |
| 58 | ret i8* %retval.0 |
| 59 | } |