File: dead_vaargs.ll

package info (click to toggle)
llvm-toolchain-3.9 1%3A3.9.1-8
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 441,060 kB
  • ctags: 428,777
  • sloc: cpp: 2,546,577; ansic: 538,318; asm: 119,677; objc: 103,316; python: 102,148; sh: 27,847; pascal: 5,626; ml: 5,510; perl: 5,293; lisp: 4,801; makefile: 2,177; xml: 686; cs: 362; php: 212; csh: 117
file content (36 lines) | stat: -rw-r--r-- 1,196 bytes parent folder | download | duplicates (18)
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
31
32
33
34
35
36
; RUN: opt < %s -deadargelim -S | FileCheck %s

define i32 @bar(i32 %A) {
  call void (i32, ...) @thunk(i32 %A, i64 47, double 1.000000e+00)
  %a = call i32 (i32, ...) @has_vastart(i32 %A, i64 47, double 1.000000e+00)
  %b = call i32 (i32, ...) @no_vastart( i32 %A, i32 %A, i32 %A, i32 %A, i64 47, double 1.000000e+00 )
  %c = add i32 %a, %b
  ret i32 %c
}
; CHECK-LABEL: define i32 @bar
; CHECK: call void (i32, ...) @thunk(i32 %A, i64 47, double 1.000000e+00)
; CHECK: call i32 (i32, ...) @has_vastart(i32 %A, i64 47, double 1.000000e+00)
; CHECK: call i32 @no_vastart(i32 %A)

declare void @thunk_target(i32 %X, ...)

define internal void @thunk(i32 %X, ...) {
  musttail call void(i32, ...) @thunk_target(i32 %X, ...)
  ret void
}
; CHECK-LABEL: define internal void @thunk(i32 %X, ...)
; CHECK: musttail call void (i32, ...) @thunk_target(i32 %X, ...)

define internal i32 @has_vastart(i32 %X, ...) {
  %valist = alloca i8
  call void @llvm.va_start(i8* %valist)
  ret i32 %X
}
; CHECK-LABEL: define internal i32 @has_vastart(i32 %X, ...)

declare void @llvm.va_start(i8*)

define internal i32 @no_vastart(i32 %X, ...) {
  ret i32 %X
}
; CHECK-LABEL: define internal i32 @no_vastart(i32 %X)