File: lsr-nonaffine.ll

package info (click to toggle)
llvm-toolchain-9 1%3A9.0.1-16
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 882,436 kB
  • sloc: cpp: 4,167,636; ansic: 714,256; asm: 457,610; python: 155,927; objc: 65,094; sh: 42,856; lisp: 26,908; perl: 7,786; pascal: 7,722; makefile: 6,881; ml: 5,581; awk: 3,648; cs: 2,027; xml: 888; javascript: 381; ruby: 156
file content (30 lines) | stat: -rw-r--r-- 860 bytes parent folder | download | duplicates (14)
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
27
28
29
30
; RUN: llc -asm-verbose=false -mtriple=x86_64-apple-darwin -o - < %s | FileCheck %s

; LSR should leave non-affine expressions alone because it currently
; doesn't know how to do anything with them, and when it tries, it
; gets SCEVExpander's current expansion for them, which is suboptimal.

; CHECK:        xorl %eax, %eax
; CHECK-NEXT:   align
; CHECK-NEXT: BB0_1:
; CHECK-NEXT:   movq  %rax, (%rdx)
; CHECK-NEXT:   addq  %rsi, %rax
; CHECK-NEXT:   cmpq  %rdi, %rax
; CHECK-NEXT:   jl
; CHECK-NEXT:   imulq %rax, %rax
; CHECK-NEXT:   ret
define i64 @foo(i64 %n, i64 %s, i64* %p) nounwind {
entry:
  br label %loop

loop:
  %i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
  store volatile i64 %i, i64* %p
  %i.next = add i64 %i, %s
  %c = icmp slt i64 %i.next, %n
  br i1 %c, label %loop, label %exit

exit:
  %mul = mul i64 %i.next, %i.next
  ret i64 %mul
}