File: fast-isel-tail-call.ll

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.6-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,304 kB
  • sloc: cpp: 7,438,677; ansic: 1,393,822; asm: 1,012,926; python: 241,650; f90: 86,635; objc: 75,479; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (24 lines) | stat: -rw-r--r-- 751 bytes parent folder | download | duplicates (29) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
; RUN: llc -fast-isel -pass-remarks-missed=isel -pass-remarks-missed=isel \
; RUN:     -mtriple arm64-- < %s 2> %t | FileCheck %s
; RUN: cat %t | FileCheck %s --check-prefix MISSED

%struct = type { [4 x i32] }

declare %struct @external()

; Check that, when fastisel falls back to SDAG, we don't emit instructions
; that follow a tail-call and would have been dropped by pure SDAGISel.

; Here, the %struct extractvalue should fail FastISel.

; MISSED: FastISel missed:   %tmp1 = extractvalue %struct %tmp0, 0

; CHECK-LABEL: test:
; CHECK: b external
; CHECK-NEXT: .Lfunc_end0:
define i32 @test() nounwind {
  %tmp0 = tail call %struct @external()
  %tmp1 = extractvalue %struct %tmp0, 0
  %tmp2 = extractvalue [4 x i32] %tmp1, 0
  ret i32 %tmp2
}