llvm-6502/test/CodeGen/AArch64/arm64-fmax.ll
Artyom Skrobov 9ce56af1eb Re-apply r237247 - [AArch64] Codegen VMAX/VMIN for safe math cases
No longer breaks SPEC2000/2006



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237361 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-14 12:59:46 +00:00

63 lines
1.9 KiB
LLVM

; RUN: llc -march=arm64 -enable-no-nans-fp-math < %s | FileCheck %s
; RUN: llc -march=arm64 < %s | FileCheck %s --check-prefix=CHECK-SAFE
define double @test_direct(float %in) {
; CHECK-LABEL: test_direct:
; CHECK-SAFE-LABEL: test_direct:
%cmp = fcmp olt float %in, 0.000000e+00
%longer = fpext float %in to double
%val = select i1 %cmp, double 0.000000e+00, double %longer
ret double %val
; CHECK: fmax
; CHECK-SAFE: fmax
}
define double @test_cross(float %in) {
; CHECK-LABEL: test_cross:
; CHECK-SAFE-LABEL: test_cross:
%cmp = fcmp ult float %in, 0.000000e+00
%longer = fpext float %in to double
%val = select i1 %cmp, double %longer, double 0.000000e+00
ret double %val
; CHECK: fmin
; CHECK-SAFE: fmin
}
; Same as previous, but with ordered comparison;
; can't be converted in safe-math mode.
define double @test_cross_fail_nan(float %in) {
; CHECK-LABEL: test_cross_fail_nan:
; CHECK-SAFE-LABEL: test_cross_fail_nan:
%cmp = fcmp olt float %in, 0.000000e+00
%longer = fpext float %in to double
%val = select i1 %cmp, double %longer, double 0.000000e+00
ret double %val
; CHECK: fmin
; CHECK-SAFE: fcsel d0, d1, d0, mi
}
; This isn't a min or a max, but passes the first condition for swapping the
; results. Make sure they're put back before we resort to the normal fcsel.
define float @test_cross_fail(float %lhs, float %rhs) {
; CHECK-LABEL: test_cross_fail:
; CHECK-SAFE-LABEL: test_cross_fail:
%tst = fcmp une float %lhs, %rhs
%res = select i1 %tst, float %rhs, float %lhs
ret float %res
; The register allocator would have to decide to be deliberately obtuse before
; other register were used.
; CHECK: fcsel s0, s1, s0, ne
; CHECK-SAFE: fcsel s0, s1, s0, ne
}
; Make sure the transformation isn't triggered for integers
define i64 @test_integer(i64 %in) {
%cmp = icmp slt i64 %in, 0
%val = select i1 %cmp, i64 0, i64 %in
ret i64 %val
}