File: mul-shift-reassoc.ll

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,634,792 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (20 lines) | stat: -rw-r--r-- 818 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-- | FileCheck %s
; RUN: llc < %s -mtriple=i686-- -early-live-intervals -verify-machineinstrs | FileCheck %s

define i32 @test(i32 %X, i32 %Y) {
	; Push the shl through the mul to allow an LEA to be formed, instead
        ; of using a shift and add separately.
; CHECK-LABEL: test:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %ecx
; CHECK-NEXT:    imull %eax, %ecx
; CHECK-NEXT:    leal (%eax,%ecx,2), %eax
; CHECK-NEXT:    retl
        %tmp.2 = shl i32 %X, 1          ; <i32> [#uses=1]
        %tmp.3 = mul i32 %tmp.2, %Y             ; <i32> [#uses=1]
        %tmp.5 = add i32 %tmp.3, %Y             ; <i32> [#uses=1]
        ret i32 %tmp.5
}