File: compact-branch-policy.ll

package info (click to toggle)
llvm-toolchain-9 1%3A9.0.1-16.1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 882,388 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 (28 lines) | stat: -rw-r--r-- 1,094 bytes parent folder | download | duplicates (26)
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
; Check that -mips-compact-branches={never,optimal,always} is accepted and honoured.
; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=never < %s | FileCheck %s -check-prefix=NEVER
; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=optimal < %s | FileCheck %s -check-prefix=OPTIMAL
; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=always < %s | FileCheck %s -check-prefix=ALWAYS

define i32 @l(i32 signext %a, i32 signext %b) {
entry:
  %add = add nsw i32 %b, %a
  %cmp = icmp slt i32 %add, 100
; NEVER: beq
; OPTIMAL: beq
; ALWAYS: beqzc
; This nop is required for correct as having (j|b)al as the instruction
; immediately following beqzc would cause a forbidden slot hazard.
; ALWAYS: nop
  br i1 %cmp, label %if.then, label %if.end

if.then:                                          ; preds = %entry
  %call = tail call i32 @k()
  br label %if.end

if.end:                                           ; preds = %entry, %if.then
  %call.pn = phi i32 [ %call, %if.then ], [ -1, %entry ]
  %c.0 = add nsw i32 %call.pn, %add
  ret i32 %c.0
}

declare i32 @k() #1