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[x86] add a test for BreakFalseDeps; NFC

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As discussed in D67363

llvm-svn: 371528
This commit is contained in:
Sanjay Patel 2019-09-10 15:42:22 +00:00
parent 0dec37607c
commit f70224dfd4
1 changed files with 20 additions and 0 deletions
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20
test/CodeGen/X86/sqrt-partial.ll
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@ -85,6 +85,26 @@ define double @minsize(double %x, double %y) minsize {
ret double %t6
}
; Partial reg avoidance may involve register allocation
; rather than adding an instruction.
define double @partial_dep_minsize(double %x, double %y) minsize {
; SSE-LABEL: partial_dep_minsize:
; SSE: # %bb.0:
; SSE-NEXT: sqrtsd %xmm1, %xmm0
; SSE-NEXT: addsd %xmm1, %xmm0
; SSE-NEXT: retq
;
; AVX-LABEL: partial_dep_minsize:
; AVX: # %bb.0:
; AVX-NEXT: vsqrtsd %xmm1, %xmm1, %xmm0
; AVX-NEXT: vaddsd %xmm1, %xmm0, %xmm0
; AVX-NEXT: retq
%t6 = tail call fast double @llvm.sqrt.f64(double %y)
%t = fadd fast double %t6, %y
ret double %t
}
declare float @sqrtf(float)
declare double @sqrt(double)
declare double @llvm.sqrt.f64(double)