File: scalarized-bitcast.ll

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (40 lines) | stat: -rw-r--r-- 1,642 bytes parent folder | download | duplicates (7)
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
37
38
39
40
; REQUIRES: asserts
; RUN: opt -loop-vectorize -force-vector-width=2 -debug-only=loop-vectorize -S -o - < %s 2>&1 | FileCheck %s

%struct.foo = type { i32, i64 }

; CHECK: LV: Found an estimated cost of 0 for VF 2 For instruction:   %0 = bitcast i64* %b to i32*

; The bitcast below will be scalarized due to the predication in the loop. Bitcasts
; between pointer types should be treated as free, despite the scalarization.
define void @foo(%struct.foo* noalias nocapture %in, i32* noalias nocapture readnone %out, i64 %n) {
entry:
  br label %for.body

for.body:                                         ; preds = %entry, %if.end
  %i.012 = phi i64 [ %inc, %if.end ], [ 0, %entry ]
  %b = getelementptr inbounds %struct.foo, %struct.foo* %in, i64 %i.012, i32 1
  %0 = bitcast i64* %b to i32*
  %a = getelementptr inbounds %struct.foo, %struct.foo* %in, i64 %i.012, i32 0
  %1 = load i32, i32* %a, align 8
  %tobool.not = icmp eq i32 %1, 0
  br i1 %tobool.not, label %if.end, label %land.lhs.true

land.lhs.true:                                    ; preds = %for.body
  %2 = load i32, i32* %0, align 4
  %cmp2 = icmp sgt i32 %2, 0
  br i1 %cmp2, label %if.then, label %if.end

if.then:                                          ; preds = %land.lhs.true
  %sub = add nsw i32 %2, -1
  store i32 %sub, i32* %0, align 4
  br label %if.end

if.end:                                           ; preds = %if.then, %land.lhs.true, %for.body
  %inc = add nuw nsw i64 %i.012, 1
  %exitcond.not = icmp eq i64 %inc, %n
  br i1 %exitcond.not, label %for.end, label %for.body

for.end:                                          ; preds = %if.end
  ret void
}