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; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s
; These tests just check that the plumbing is in place for @llvm.bitreverse. The
; actual output is massive at the moment as llvm.bitreverse is not yet legal.
declare <2 x i16> @llvm.bitreverse.v2i16(<2 x i16>) readnone
define <2 x i16> @f(<2 x i16> %a) {
; CHECK-LABEL: f:
; CHECK: shll
%b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
ret <2 x i16> %b
}
declare i8 @llvm.bitreverse.i8(i8) readnone
define i8 @g(i8 %a) {
; CHECK-LABEL: g:
; CHECK: shlb
%b = call i8 @llvm.bitreverse.i8(i8 %a)
ret i8 %b
}
; These tests check that bitreverse(constant) calls are folded
define <2 x i16> @fold_v2i16() {
; CHECK-LABEL: fold_v2i16:
; CHECK: # BB#0:
; CHECK-NEXT: movw $-4096, %ax # imm = 0xFFFFFFFFFFFFF000
; CHECK-NEXT: movw $240, %dx
; CHECK-NEXT: retl
%b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> <i16 15, i16 3840>)
ret <2 x i16> %b
}
define i8 @fold_i8() {
; CHECK-LABEL: fold_i8:
; CHECK: # BB#0:
; CHECK-NEXT: movb $-16, %al
; CHECK-NEXT: retl
%b = call i8 @llvm.bitreverse.i8(i8 15)
ret i8 %b
}
; These tests check that bitreverse(bitreverse()) calls are removed
define i8 @identity_i8(i8 %a) {
; CHECK-LABEL: identity_i8:
; CHECK: # BB#0:
; CHECK-NEXT: movb {{[0-9]+}}(%esp), %al
; CHECK-NEXT: retl
%b = call i8 @llvm.bitreverse.i8(i8 %a)
%c = call i8 @llvm.bitreverse.i8(i8 %b)
ret i8 %c
}
define <2 x i16> @identity_v2i16(<2 x i16> %a) {
; CHECK-LABEL: identity_v2i16:
; CHECK: # BB#0:
; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %edx
; CHECK-NEXT: retl
%b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
%c = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %b)
ret <2 x i16> %c
}
; These tests check that bitreverse(undef) calls are removed
define i8 @undef_i8() {
; CHECK-LABEL: undef_i8:
; CHECK: # BB#0:
; CHECK-NEXT: retl
%b = call i8 @llvm.bitreverse.i8(i8 undef)
ret i8 %b
}
define <2 x i16> @undef_v2i16() {
; CHECK-LABEL: undef_v2i16:
; CHECK: # BB#0:
; CHECK-NEXT: retl
%b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> undef)
ret <2 x i16> %b
}
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