forked from OSchip/llvm-project
20 lines
644 B
LLVM
20 lines
644 B
LLVM
; RUN: llc -march=nvptx -verify-machineinstrs < %s | FileCheck %s
|
|
|
|
; Tests the following pattern:
|
|
; (X & 8) != 0 --> (X & 8) >> 3
|
|
|
|
; This produces incorrect code in general when boolean false is
|
|
; represented as a negative one. There is however a special
|
|
; case when the type has a bitsize of 1, for which the false
|
|
; value will be identical regardless of the boolean representation.
|
|
; Check that the optimization triggers in this case.
|
|
|
|
; CHECK-LABEL: @pow2_mask_cmp
|
|
; CHECK: bfe.u32 {{%r[0-9]+}}, {{%r[0-9]+}}, 3, 1
|
|
define i32 @pow2_mask_cmp(i32 %x) {
|
|
%a = and i32 %x, 8
|
|
%cmp = icmp ne i32 %a, 0
|
|
%r = zext i1 %cmp to i32
|
|
ret i32 %r
|
|
}
|