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llvm-mirror/test/CodeGen/X86/fdiv.ll
Duncan Sands 6d360055c5 Add a comment noting that the fdiv -> fmul conversion won't generate
multiplication by a denormal, and some tests checking that.

llvm-svn: 154431
2012-04-10 20:35:27 +00:00

42 lines
972 B
LLVM

; RUN: llc < %s -march=x86-64 -enable-unsafe-fp-math | FileCheck %s
define double @exact(double %x) {
; Exact division by a constant converted to multiplication.
; CHECK: @exact
; CHECK: mulsd
%div = fdiv double %x, 2.0
ret double %div
}
define double @inexact(double %x) {
; Inexact division by a constant converted to multiplication.
; CHECK: @inexact
; CHECK: mulsd
%div = fdiv double %x, 0x41DFFFFFFFC00000
ret double %div
}
define double @funky(double %x) {
; No conversion to multiplication if too funky.
; CHECK: @funky
; CHECK: divsd
%div = fdiv double %x, 0.0
ret double %div
}
define double @denormal1(double %x) {
; Don't generate multiplication by a denormal.
; CHECK: @denormal1
; CHECK: divsd
%div = fdiv double %x, 0x7FD0000000000001
ret double %div
}
define double @denormal2(double %x) {
; Don't generate multiplication by a denormal.
; CHECK: @denormal
; CHECK: divsd
%div = fdiv double %x, 0x7FEFFFFFFFFFFFFF
ret double %div
}