llvm-mirror/x86_64-mul-by-const.ll at 2b3ad7e4dc1eaca74dffda4833ff344aecbf304c - llvm-mirror - Git.je (Gitea)

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Dale Johannesen c2c6ebd82a Add a transform to DAG Combiner. This improves the

code for the case where 32-bit divide by constant is
turned into 64-bit multiply by constant.  8771012.

llvm-svn: 122090

2010-12-17 21:45:49 +00:00

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 ; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
 ; Formerly there were two shifts.  8771012.
 define i32 @f9188_mul365384439_shift27(i32 %A) nounwind {
 ; CHECK:  imulq $365384439,
 ; CHECK:  shrq  $59, %rax
         %tmp1 = udiv i32 %A, 1577682821         ; <i32> [#uses=1]
         ret i32 %tmp1
 }