llvm-mirror/test/CodeGen/AArch64/arm64-rounding.ll
Stephen Canon 7777a204e2 Don't raise inexact when lowering ceil, floor, round, trunc.
The C standard has historically not specified whether or not these functions should raise the inexact flag. Traditionally on Darwin, these functions *did* raise inexact, and the llvm lowerings followed that conventions. n1778 (C bindings for IEEE-754 (2008)) clarifies that these functions should not set inexact. This patch brings the lowerings for arm64 and x86 in line with the newly specified behavior.  This also lets us fold some logic into TD patterns, which is nice.

Differential Revision: http://reviews.llvm.org/D12969

llvm-svn: 248266
2015-09-22 11:43:17 +00:00

205 lines
4.3 KiB
LLVM

; RUN: llc -O3 < %s -mtriple=arm64 | FileCheck %s
; CHECK-LABEL: test1:
; CHECK: frintm
; CHECK-NOT: frintx
define float @test1(float %a) #0 {
entry:
%call = tail call float @floorf(float %a) nounwind readnone
ret float %call
}
declare float @floorf(float) nounwind readnone
; CHECK-LABEL: test2:
; CHECK: frintm
; CHECK-NOT: frintx
define double @test2(double %a) #0 {
entry:
%call = tail call double @floor(double %a) nounwind readnone
ret double %call
}
declare double @floor(double) nounwind readnone
; CHECK-LABEL: test3:
; CHECK: frinti
define float @test3(float %a) #0 {
entry:
%call = tail call float @nearbyintf(float %a) nounwind readnone
ret float %call
}
declare float @nearbyintf(float) nounwind readnone
; CHECK-LABEL: test4:
; CHECK: frinti
define double @test4(double %a) #0 {
entry:
%call = tail call double @nearbyint(double %a) nounwind readnone
ret double %call
}
declare double @nearbyint(double) nounwind readnone
; CHECK-LABEL: test5:
; CHECK: frintp
; CHECK-NOT: frintx
define float @test5(float %a) #0 {
entry:
%call = tail call float @ceilf(float %a) nounwind readnone
ret float %call
}
declare float @ceilf(float) nounwind readnone
; CHECK-LABEL: test6:
; CHECK: frintp
; CHECK-NOT: frintx
define double @test6(double %a) #0 {
entry:
%call = tail call double @ceil(double %a) nounwind readnone
ret double %call
}
declare double @ceil(double) nounwind readnone
; CHECK-LABEL: test7:
; CHECK: frintx
define float @test7(float %a) #0 {
entry:
%call = tail call float @rintf(float %a) nounwind readnone
ret float %call
}
declare float @rintf(float) nounwind readnone
; CHECK-LABEL: test8:
; CHECK: frintx
define double @test8(double %a) #0 {
entry:
%call = tail call double @rint(double %a) nounwind readnone
ret double %call
}
declare double @rint(double) nounwind readnone
; CHECK-LABEL: test9:
; CHECK: frintz
; CHECK-NOT: frintx
define float @test9(float %a) #0 {
entry:
%call = tail call float @truncf(float %a) nounwind readnone
ret float %call
}
declare float @truncf(float) nounwind readnone
; CHECK-LABEL: test10:
; CHECK: frintz
; CHECK-NOT: frintx
define double @test10(double %a) #0 {
entry:
%call = tail call double @trunc(double %a) nounwind readnone
ret double %call
}
declare double @trunc(double) nounwind readnone
; CHECK-LABEL: test11:
; CHECK: frinta
; CHECK-NOT: frintx
define float @test11(float %a) #0 {
entry:
%call = tail call float @roundf(float %a) nounwind readnone
ret float %call
}
declare float @roundf(float %a) nounwind readnone
; CHECK-LABEL: test12:
; CHECK: frinta
; CHECK-NOT: frintx
define double @test12(double %a) #0 {
entry:
%call = tail call double @round(double %a) nounwind readnone
ret double %call
}
declare double @round(double %a) nounwind readnone
; CHECK-LABEL: test13:
; CHECK-NOT: frintx
; CHECK: frintm
define float @test13(float %a) #1 {
entry:
%call = tail call float @floorf(float %a) nounwind readnone
ret float %call
}
; CHECK-LABEL: test14:
; CHECK-NOT: frintx
; CHECK: frintm
define double @test14(double %a) #1 {
entry:
%call = tail call double @floor(double %a) nounwind readnone
ret double %call
}
; CHECK-LABEL: test15:
; CHECK-NOT: frintx
; CHECK: frintp
define float @test15(float %a) #1 {
entry:
%call = tail call float @ceilf(float %a) nounwind readnone
ret float %call
}
; CHECK-LABEL: test16:
; CHECK-NOT: frintx
; CHECK: frintp
define double @test16(double %a) #1 {
entry:
%call = tail call double @ceil(double %a) nounwind readnone
ret double %call
}
; CHECK-LABEL: test17:
; CHECK-NOT: frintx
; CHECK: frintz
define float @test17(float %a) #1 {
entry:
%call = tail call float @truncf(float %a) nounwind readnone
ret float %call
}
; CHECK-LABEL: test18:
; CHECK-NOT: frintx
; CHECK: frintz
define double @test18(double %a) #1 {
entry:
%call = tail call double @trunc(double %a) nounwind readnone
ret double %call
}
; CHECK-LABEL: test19:
; CHECK-NOT: frintx
; CHECK: frinta
define float @test19(float %a) #1 {
entry:
%call = tail call float @roundf(float %a) nounwind readnone
ret float %call
}
; CHECK-LABEL: test20:
; CHECK-NOT: frintx
; CHECK: frinta
define double @test20(double %a) #1 {
entry:
%call = tail call double @round(double %a) nounwind readnone
ret double %call
}
attributes #0 = { nounwind }
attributes #1 = { nounwind "unsafe-fp-math"="true" }