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llvm-mirror/test/CodeGen/ARM/clz.ll
Eli Friedman e1067659a3 [ARM] Lower llvm.ctlz.i32 to a libcall when clz is not available.
The inline sequence is very long (about 70 bytes on Thumb1), so it's
not really a good idea to inline it, especially when optimizing for
size.

Differential Revision: https://reviews.llvm.org/D47917

llvm-svn: 340458
2018-08-22 21:47:14 +00:00

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388 B
LLVM

; RUN: llc -mtriple=arm-eabi -mattr=+v5t %s -o - | FileCheck %s -check-prefixes=CHECK,INLINE
; RUN: llc -mtriple=arm-eabi %s -o - | FileCheck %s -check-prefixes=CHECK,LIBCALL
declare i32 @llvm.ctlz.i32(i32, i1)
define i32 @test(i32 %x) {
; CHECK-LABEL: test
; INLINE: clz r0, r0
; LIBCALL: b __clzsi2
%tmp.1 = call i32 @llvm.ctlz.i32( i32 %x, i1 true )
ret i32 %tmp.1
}