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[Tests] Add a unordered atomic load combine test 

llvm-svn: 373659
This commit is contained in:
Philip Reames 2019-10-03 20:28:59 +00:00
parent 65d63ac05a
commit 82cb5bc302
1 changed files with 33 additions and 0 deletions
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33
llvm/test/CodeGen/X86/atomic-unordered.ll
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@ -2680,3 +2680,36 @@ define i64 @load_i16_anyext_i64(i16* %ptr) {
%res = bitcast <4 x i16> %vec to i64
ret i64 %res
}
; TODO: Would be legal to combine for legal atomic wider types
define i16 @load_combine(i8* %p) {
; CHECK-O0-LABEL: load_combine:
; CHECK-O0: # %bb.0:
; CHECK-O0-NEXT: movb (%rdi), %al
; CHECK-O0-NEXT: movb 1(%rdi), %cl
; CHECK-O0-NEXT: movzbl %al, %edx
; CHECK-O0-NEXT: # kill: def $dx killed $dx killed $edx
; CHECK-O0-NEXT: movzbl %cl, %esi
; CHECK-O0-NEXT: # kill: def $si killed $si killed $esi
; CHECK-O0-NEXT: shlw $8, %si
; CHECK-O0-NEXT: orw %si, %dx
; CHECK-O0-NEXT: movw %dx, %ax
; CHECK-O0-NEXT: retq
;
; CHECK-O3-LABEL: load_combine:
; CHECK-O3: # %bb.0:
; CHECK-O3-NEXT: movzbl (%rdi), %ecx
; CHECK-O3-NEXT: movzbl 1(%rdi), %eax
; CHECK-O3-NEXT: shll $8, %eax
; CHECK-O3-NEXT: orl %ecx, %eax
; CHECK-O3-NEXT: # kill: def $ax killed $ax killed $eax
; CHECK-O3-NEXT: retq
%v1 = load atomic i8, i8* %p unordered, align 2
%p2 = getelementptr i8, i8* %p, i64 1
%v2 = load atomic i8, i8* %p2 unordered, align 1
%v1.ext = zext i8 %v1 to i16
%v2.ext = zext i8 %v2 to i16
%v2.sht = shl i16 %v2.ext, 8
%res = or i16 %v1.ext, %v2.sht
ret i16 %res
}