llvm/cttz.ll at 6d024c616a2a4959f8dfe5c64d27f89b394cf042 - llvm - Gitea: Git with a cup of tea

RPCSX/llvm

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Hal Finkel e60bc4e8b8 [PowerPC] Replace cntlz[.] with cntlzw[.]

cntlz is the old POWER mnemonic. cntlzw is the PowerPC mnemonic.

This change fixes an issue when -no-integrated-as: The opcode cntlz is
unrecognized by gas

Alias the POWER mnemonic cntlz[.] to the PowerPC mnemonic cntlzw[.]
This is done for because the POWER cntlz mnemonic has be used by LLVM for
a very long time. We need to make sure that assembly programs
that are using the cntlz[.] do not break with this change.

Change PowerPC tests to reflect the insn change from cntlz to cntlzw.
Add assembly test to verify cntlz[.] is encoded correctly.

Patch by Tom Rix!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251489 91177308-0d34-0410-b5e6-96231b3b80d8

2015-10-28 03:26:45 +00:00

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 ; Make sure this testcase does not use ctpop
 ; RUN: llc < %s -march=ppc32 -mcpu=g5 | FileCheck %s
 declare i32 @llvm.cttz.i32(i32, i1)
 define i32 @bar(i32 %x) {
 entry:
 ; CHECK: @bar
 ; CHECK: cntlzw
         %tmp.1 = call i32 @llvm.cttz.i32( i32 %x, i1 true )              ; <i32> [#uses=1]
         ret i32 %tmp.1
 }