2012-04-08 20:08:12 +02:00
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; RUN: llc < %s -march=x86-64 -enable-unsafe-fp-math | FileCheck %s
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2012-04-07 22:04:00 +02:00
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define double @exact(double %x) {
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2012-04-08 20:08:12 +02:00
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; Exact division by a constant converted to multiplication.
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2015-08-07 23:38:53 +02:00
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; CHECK-LABEL: exact:
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; CHECK: ## BB#0:
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; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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2012-04-07 22:04:00 +02:00
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%div = fdiv double %x, 2.0
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ret double %div
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}
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define double @inexact(double %x) {
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2012-04-08 20:08:12 +02:00
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; Inexact division by a constant converted to multiplication.
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2015-08-07 23:38:53 +02:00
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; CHECK-LABEL: inexact:
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; CHECK: ## BB#0:
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; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 0x41DFFFFFFFC00000
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2012-04-07 22:04:00 +02:00
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ret double %div
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}
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define double @funky(double %x) {
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; No conversion to multiplication if too funky.
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2015-08-07 23:38:53 +02:00
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; CHECK-LABEL: funky:
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; CHECK: ## BB#0:
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; CHECK-NEXT: xorpd %xmm1, %xmm1
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; CHECK-NEXT: divsd %xmm1, %xmm0
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; CHECK-NEXT: retq
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2012-04-07 22:04:00 +02:00
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%div = fdiv double %x, 0.0
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ret double %div
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}
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2012-04-10 22:35:27 +02:00
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define double @denormal1(double %x) {
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; Don't generate multiplication by a denormal.
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2015-08-07 23:38:53 +02:00
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; CHECK-LABEL: denormal1:
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; CHECK: ## BB#0:
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; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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2012-04-10 22:35:27 +02:00
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%div = fdiv double %x, 0x7FD0000000000001
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ret double %div
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}
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define double @denormal2(double %x) {
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; Don't generate multiplication by a denormal.
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2015-08-07 23:38:53 +02:00
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; CHECK-LABEL: denormal2:
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; CHECK: ## BB#0:
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; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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2012-04-10 22:35:27 +02:00
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%div = fdiv double %x, 0x7FEFFFFFFFFFFFFF
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ret double %div
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}
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2015-08-07 23:38:53 +02:00
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