File: ipra-local-linkage.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (30 lines) | stat: -rw-r--r-- 1,045 bytes parent folder | download | duplicates (28) 
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 < %s | FileCheck %s -check-prefix=NOIPRA
; RUN: llc -enable-ipra < %s | FileCheck %s

target triple = "x86_64--"

define internal void @foo() norecurse {
; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg.
; NOIPRA-LABEL: foo:
; NOIPRA: pushq	%r15
; When IPRA is enabled none register should be saved as foo() is local function
; so we optimize it to save no registers.
; CHECK-LABEL: foo:
; CHECK-NOT: pushq %r15
  call void asm sideeffect "movl	%r14d, %r15d", "~{r15}"()
  ret void
}

define void @bar(i32 %X) {
  call void asm sideeffect "movl  %r12d, $0", "{r15}~{r12}"(i32 %X)
  ; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be
  ; saved if register containing orignal value is also getting clobbered
  ; and reloaded after foo(), here original value is loaded back into R15D after
  ; call to foo.
  call void @foo()
  ; CHECK-LABEL: bar:
  ; CHECK: callq foo
  ; CHECK-NEXT: movl  %edi, %r15d
  call void asm sideeffect "movl  $0, %r12d", "{r15}~{r12}"(i32 %X)
  ret void
}