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llvm/test/CodeGen/X86/fast-isel-cmp-branch3.ll
Cong Hou 58aed69858 Allow X86::COND_NE_OR_P and X86::COND_NP_OR_E to be reversed. 
Currently, AnalyzeBranch() fails non-equality comparison between floating points
on X86 (see https://llvm.org/bugs/show_bug.cgi?id=23875). This is because this
function can modify the branch by reversing the conditional jump and removing
unconditional jump if there is a proper fall-through. However, in the case of
non-equality comparison between floating points, this can turn the branch
"unanalyzable". Consider the following case:

jne.BB1
jp.BB1
jmp.BB2
.BB1:
...
.BB2:
...

AnalyzeBranch() will reverse "jp .BB1" to "jnp .BB2" and then "jmp .BB2" will be
removed:

jne.BB1
jnp.BB2
.BB1:
...
.BB2:
...

However, AnalyzeBranch() cannot analyze this branch anymore as there are two
conditional jumps with different targets. This may disable some optimizations
like block-placement: in this case the fall-through behavior is enforced even if
the fall-through block is very cold, which is suboptimal.

Actually this optimization is also done in block-placement pass, which means we
can remove this optimization from AnalyzeBranch(). However, currently
X86::COND_NE_OR_P and X86::COND_NP_OR_E are not reversible: there is no defined
negation conditions for them.

In order to reverse them, this patch defines two new CondCode X86::COND_E_AND_NP
and X86::COND_P_AND_NE. It also defines how to synthesize instructions for them.
Here only the second conditional jump is reversed. This is valid as we only need
them to do this "unconditional jump removal" optimization.


Differential Revision: http://reviews.llvm.org/D11393




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264199 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-23 21:45:37 +00:00

470 lines
8.8 KiB
LLVM
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; RUN: llc < %s -fast-isel -fast-isel-abort=1 -mtriple=x86_64-apple-darwin10 | FileCheck %s
define i32 @fcmp_oeq1(float %x) {
; CHECK-LABEL: fcmp_oeq1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp oeq float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_oeq2(float %x) {
; CHECK-LABEL: fcmp_oeq2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jne {{LBB.+_1}}
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp oeq float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ogt1(float %x) {
; CHECK-LABEL: fcmp_ogt1
; CHECK-NOT: ucomiss
; CHECK: movl $1, %eax
%1 = fcmp ogt float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ogt2(float %x) {
; CHECK-LABEL: fcmp_ogt2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jbe {{LBB.+_1}}
%1 = fcmp ogt float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_oge1(float %x) {
; CHECK-LABEL: fcmp_oge1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp oge float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_oge2(float %x) {
; CHECK-LABEL: fcmp_oge2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jb {{LBB.+_1}}
%1 = fcmp oge float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_olt1(float %x) {
; CHECK-LABEL: fcmp_olt1
; CHECK-NOT: ucomiss
; CHECK: movl $1, %eax
%1 = fcmp olt float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_olt2(float %x) {
; CHECK-LABEL: fcmp_olt2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: jbe {{LBB.+_1}}
%1 = fcmp olt float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ole1(float %x) {
; CHECK-LABEL: fcmp_ole1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp ole float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ole2(float %x) {
; CHECK-LABEL: fcmp_ole2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: jb {{LBB.+_1}}
%1 = fcmp ole float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_one1(float %x) {
; CHECK-LABEL: fcmp_one1
; CHECK-NOT: ucomiss
; CHECK: movl $1, %eax
%1 = fcmp one float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_one2(float %x) {
; CHECK-LABEL: fcmp_one2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: je {{LBB.+_1}}
%1 = fcmp one float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ord1(float %x) {
; CHECK-LABEL: fcmp_ord1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp ord float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ord2(float %x) {
; CHECK-LABEL: fcmp_ord2
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_1}}
%1 = fcmp ord float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_uno1(float %x) {
; CHECK-LABEL: fcmp_uno1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_2}}
%1 = fcmp uno float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_uno2(float %x) {
; CHECK-LABEL: fcmp_uno2
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jp {{LBB.+_2}}
%1 = fcmp uno float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ueq1(float %x) {
; CHECK-LABEL: fcmp_ueq1
; CHECK-NOT: ucomiss
%1 = fcmp ueq float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ueq2(float %x) {
; CHECK-LABEL: fcmp_ueq2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: je {{LBB.+_2}}
%1 = fcmp ueq float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ugt1(float %x) {
; CHECK-LABEL: fcmp_ugt1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jnp {{LBB.+_1}}
%1 = fcmp ugt float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ugt2(float %x) {
; CHECK-LABEL: fcmp_ugt2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: jae {{LBB.+_1}}
%1 = fcmp ugt float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_uge1(float %x) {
; CHECK-LABEL: fcmp_uge1
; CHECK-NOT: ucomiss
%1 = fcmp uge float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_uge2(float %x) {
; CHECK-LABEL: fcmp_uge2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: ja {{LBB.+_1}}
%1 = fcmp uge float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ult1(float %x) {
; CHECK-LABEL: fcmp_ult1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jnp {{LBB.+_1}}
%1 = fcmp ult float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ult2(float %x) {
; CHECK-LABEL: fcmp_ult2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jae {{LBB.+_1}}
%1 = fcmp ult float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ule1(float %x) {
; CHECK-LABEL: fcmp_ule1
; CHECK-NOT: ucomiss
%1 = fcmp ule float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_ule2(float %x) {
; CHECK-LABEL: fcmp_ule2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: ja {{LBB.+_1}}
%1 = fcmp ule float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_une1(float %x) {
; CHECK-LABEL: fcmp_une1
; CHECK: ucomiss %xmm0, %xmm0
; CHECK-NEXT: jnp {{LBB.+_1}}
%1 = fcmp une float %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @fcmp_une2(float %x) {
; CHECK-LABEL: fcmp_une2
; CHECK: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jne {{LBB.+_2}}
; CHECK-NEXT: jnp {{LBB.+_1}}
%1 = fcmp une float %x, 0.000000e+00
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_eq(i32 %x) {
; CHECK-LABEL: icmp_eq
; CHECK-NOT: cmpl
; CHECK: xorl %eax, %eax
%1 = icmp eq i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_ne(i32 %x) {
; CHECK-LABEL: icmp_ne
; CHECK-NOT: cmpl
; CHECK: movl $1, %eax
%1 = icmp ne i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_ugt(i32 %x) {
; CHECK-LABEL: icmp_ugt
; CHECK-NOT: cmpl
; CHECK: movl $1, %eax
%1 = icmp ugt i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_uge(i32 %x) {
; CHECK-LABEL: icmp_uge
; CHECK-NOT: cmpl
; CHECK: xorl %eax, %eax
%1 = icmp uge i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_ult(i32 %x) {
; CHECK-LABEL: icmp_ult
; CHECK-NOT: cmpl
; CHECK: movl $1, %eax
%1 = icmp ult i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_ule(i32 %x) {
; CHECK-LABEL: icmp_ule
; CHECK-NOT: cmpl
; CHECK: xorl %eax, %eax
%1 = icmp ule i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_sgt(i32 %x) {
; CHECK-LABEL: icmp_sgt
; CHECK-NOT: cmpl
; CHECK: movl $1, %eax
%1 = icmp sgt i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_sge(i32 %x) {
; CHECK-LABEL: icmp_sge
; CHECK-NOT: cmpl
; CHECK: xorl %eax, %eax
%1 = icmp sge i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_slt(i32 %x) {
; CHECK-LABEL: icmp_slt
; CHECK-NOT: cmpl
; CHECK: movl $1, %eax
%1 = icmp slt i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
define i32 @icmp_sle(i32 %x) {
; CHECK-LABEL: icmp_sle
; CHECK-NOT: cmpl
; CHECK: xorl %eax, %eax
%1 = icmp sle i32 %x, %x
br i1 %1, label %bb1, label %bb2
bb2:
ret i32 1
bb1:
ret i32 0
}
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