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llvm-6502/test/CodeGen/X86/select.ll
Andrew Trick 6a7770b7ae Enable MI Sched for x86. 
This changes the SelectionDAG scheduling preference to source
order. Soon, the SelectionDAG scheduler can be bypassed saving
a nice chunk of compile time.

Performance differences that result from this change are often a
consequence of register coalescing. The register coalescer is far from
perfect. Bugs can be filed for deficiencies.

On x86 SandyBridge/Haswell, the source order schedule is often
preserved, particularly for small blocks.

Register pressure is generally improved over the SD scheduler's ILP
mode. However, we are still able to handle large blocks that require
latency hiding, unlike the SD scheduler's BURR mode. MI scheduler also
attempts to discover the critical path in single-block loops and
adjust heuristics accordingly.

The MI scheduler relies on the new machine model. This is currently
unimplemented for AVX, so we may not be generating the best code yet.

Unit tests are updated so they don't depend on SD scheduling heuristics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192750 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-15 23:33:07 +00:00

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LLVM
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; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -mcpu=generic | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -mcpu=atom | FileCheck -check-prefix=ATOM %s
; PR5757
%0 = type { i64, i32 }
define i32 @test1(%0* %p, %0* %q, i1 %r) nounwind {
%t0 = load %0* %p
%t1 = load %0* %q
%t4 = select i1 %r, %0 %t0, %0 %t1
%t5 = extractvalue %0 %t4, 1
ret i32 %t5
; CHECK-LABEL: test1:
; CHECK: cmovneq %rdi, %rsi
; CHECK: movl (%rsi), %eax
; ATOM-LABEL: test1:
; ATOM: cmovneq %rdi, %rsi
; ATOM: movl (%rsi), %eax
}
; PR2139
define i32 @test2() nounwind {
entry:
%tmp73 = tail call i1 @return_false() ; <i8> [#uses=1]
%g.0 = select i1 %tmp73, i16 0, i16 -480 ; <i16> [#uses=2]
%tmp7778 = sext i16 %g.0 to i32 ; <i32> [#uses=1]
%tmp80 = shl i32 %tmp7778, 3 ; <i32> [#uses=2]
%tmp87 = icmp sgt i32 %tmp80, 32767 ; <i1> [#uses=1]
br i1 %tmp87, label %bb90, label %bb91
bb90: ; preds = %bb84, %bb72
unreachable
bb91: ; preds = %bb84
ret i32 0
; CHECK-LABEL: test2:
; CHECK: cmovnew
; CHECK: cwtl
; ATOM-LABEL: test2:
; ATOM: cmovnew
; ATOM: cwtl
}
declare i1 @return_false()
;; Select between two floating point constants.
define float @test3(i32 %x) nounwind readnone {
entry:
%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
%iftmp.0.0 = select i1 %0, float 4.200000e+01, float 2.300000e+01 ; <float> [#uses=1]
ret float %iftmp.0.0
; CHECK-LABEL: test3:
; CHECK: movss {{.*}},4), %xmm0
; ATOM-LABEL: test3:
; ATOM: movss {{.*}},4), %xmm0
}
define signext i8 @test4(i8* nocapture %P, double %F) nounwind readonly {
entry:
%0 = fcmp olt double %F, 4.200000e+01 ; <i1> [#uses=1]
%iftmp.0.0 = select i1 %0, i32 4, i32 0 ; <i32> [#uses=1]
%1 = getelementptr i8* %P, i32 %iftmp.0.0 ; <i8*> [#uses=1]
%2 = load i8* %1, align 1 ; <i8> [#uses=1]
ret i8 %2
; CHECK-LABEL: test4:
; CHECK: movsbl ({{.*}},4), %eax
; ATOM-LABEL: test4:
; ATOM: movsbl ({{.*}},4), %eax
}
define void @test5(i1 %c, <2 x i16> %a, <2 x i16> %b, <2 x i16>* %p) nounwind {
%x = select i1 %c, <2 x i16> %a, <2 x i16> %b
store <2 x i16> %x, <2 x i16>* %p
ret void
; CHECK-LABEL: test5:
; ATOM-LABEL: test5:
}
define void @test6(i32 %C, <4 x float>* %A, <4 x float>* %B) nounwind {
%tmp = load <4 x float>* %A ; <<4 x float>> [#uses=1]
%tmp3 = load <4 x float>* %B ; <<4 x float>> [#uses=2]
%tmp9 = fmul <4 x float> %tmp3, %tmp3 ; <<4 x float>> [#uses=1]
%tmp.upgrd.1 = icmp eq i32 %C, 0 ; <i1> [#uses=1]
%iftmp.38.0 = select i1 %tmp.upgrd.1, <4 x float> %tmp9, <4 x float> %tmp ; <<4 x float>> [#uses=1]
store <4 x float> %iftmp.38.0, <4 x float>* %A
ret void
; Verify that the fmul gets sunk into the one part of the diamond where it is
; needed.
; CHECK-LABEL: test6:
; CHECK: je
; CHECK: ret
; CHECK: mulps
; CHECK: ret
; ATOM-LABEL: test6:
; ATOM: je
; ATOM: ret
; ATOM: mulps
; ATOM: ret
}
; Select with fp80's
define x86_fp80 @test7(i32 %tmp8) nounwind {
%tmp9 = icmp sgt i32 %tmp8, -1 ; <i1> [#uses=1]
%retval = select i1 %tmp9, x86_fp80 0xK4005B400000000000000, x86_fp80 0xK40078700000000000000
ret x86_fp80 %retval
; CHECK-LABEL: test7:
; CHECK: leaq
; CHECK: fldt (%r{{.}}x,%r{{.}}x)
; ATOM-LABEL: test7:
; ATOM: leaq
; ATOM: fldt (%r{{.}}x,%r{{.}}x)
}
; widening select v6i32 and then a sub
define void @test8(i1 %c, <6 x i32>* %dst.addr, <6 x i32> %src1,<6 x i32> %src2) nounwind {
%x = select i1 %c, <6 x i32> %src1, <6 x i32> %src2
%val = sub <6 x i32> %x, < i32 1, i32 1, i32 1, i32 1, i32 1, i32 1 >
store <6 x i32> %val, <6 x i32>* %dst.addr
ret void
; CHECK-LABEL: test8:
; ATOM-LABEL: test8:
}
;; Test integer select between values and constants.
define i64 @test9(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp ne i64 %x, 0
%cond = select i1 %cmp, i64 %y, i64 -1
ret i64 %cond
; CHECK-LABEL: test9:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: orq %rsi, %rax
; CHECK: ret
; ATOM-LABEL: test9:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: orq %rsi, %rax
; ATOM: ret
}
;; Same as test9
define i64 @test9a(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp eq i64 %x, 0
%cond = select i1 %cmp, i64 -1, i64 %y
ret i64 %cond
; CHECK-LABEL: test9a:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: orq %rsi, %rax
; CHECK: ret
; ATOM-LABEL: test9a:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: orq %rsi, %rax
; ATOM: ret
}
define i64 @test9b(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp eq i64 %x, 0
%A = sext i1 %cmp to i64
%cond = or i64 %y, %A
ret i64 %cond
; CHECK-LABEL: test9b:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: orq %rsi, %rax
; CHECK: ret
; ATOM-LABEL: test9b:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: orq %rsi, %rax
; ATOM: ret
}
;; Select between -1 and 1.
define i64 @test10(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp eq i64 %x, 0
%cond = select i1 %cmp, i64 -1, i64 1
ret i64 %cond
; CHECK-LABEL: test10:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: orq $1, %rax
; CHECK: ret
; ATOM-LABEL: test10:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: orq $1, %rax
; ATOM: ret
}
define i64 @test11(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp eq i64 %x, 0
%cond = select i1 %cmp, i64 %y, i64 -1
ret i64 %cond
; CHECK-LABEL: test11:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: notq %rax
; CHECK: orq %rsi, %rax
; CHECK: ret
; ATOM-LABEL: test11:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: notq %rax
; ATOM: orq %rsi, %rax
; ATOM: ret
}
define i64 @test11a(i64 %x, i64 %y) nounwind readnone ssp noredzone {
%cmp = icmp ne i64 %x, 0
%cond = select i1 %cmp, i64 -1, i64 %y
ret i64 %cond
; CHECK-LABEL: test11a:
; CHECK: cmpq $1, %rdi
; CHECK: sbbq %rax, %rax
; CHECK: notq %rax
; CHECK: orq %rsi, %rax
; CHECK: ret
; ATOM-LABEL: test11a:
; ATOM: cmpq $1, %rdi
; ATOM: sbbq %rax, %rax
; ATOM: notq %rax
; ATOM: orq %rsi, %rax
; ATOM: ret
}
declare noalias i8* @_Znam(i64) noredzone
define noalias i8* @test12(i64 %count) nounwind ssp noredzone {
entry:
%A = tail call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %count, i64 4)
%B = extractvalue { i64, i1 } %A, 1
%C = extractvalue { i64, i1 } %A, 0
%D = select i1 %B, i64 -1, i64 %C
%call = tail call noalias i8* @_Znam(i64 %D) nounwind noredzone
ret i8* %call
; CHECK-LABEL: test12:
; CHECK: mulq
; CHECK: movq $-1, %[[R:r..]]
; CHECK: cmovnoq %rax, %[[R]]
; CHECK: jmp __Znam
; ATOM-LABEL: test12:
; ATOM: mulq
; ATOM: movq $-1, %rdi
; ATOM: cmovnoq %rax, %rdi
; ATOM: jmp __Znam
}
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) nounwind readnone
define i32 @test13(i32 %a, i32 %b) nounwind {
%c = icmp ult i32 %a, %b
%d = sext i1 %c to i32
ret i32 %d
; CHECK-LABEL: test13:
; CHECK: cmpl
; CHECK-NEXT: sbbl
; CHECK-NEXT: ret
; ATOM-LABEL: test13:
; ATOM: cmpl
; ATOM-NEXT: sbbl
; ATOM: ret
}
define i32 @test14(i32 %a, i32 %b) nounwind {
%c = icmp uge i32 %a, %b
%d = sext i1 %c to i32
ret i32 %d
; CHECK-LABEL: test14:
; CHECK: cmpl
; CHECK-NEXT: sbbl
; CHECK-NEXT: notl
; CHECK-NEXT: ret
; ATOM-LABEL: test14:
; ATOM: cmpl
; ATOM-NEXT: sbbl
; ATOM-NEXT: notl
; ATOM: ret
}
; rdar://10961709
define i32 @test15(i32 %x) nounwind {
entry:
%cmp = icmp ne i32 %x, 0
%sub = sext i1 %cmp to i32
ret i32 %sub
; CHECK-LABEL: test15:
; CHECK: negl
; CHECK: sbbl
; ATOM-LABEL: test15:
; ATOM: negl
; ATOM: sbbl
}
define i64 @test16(i64 %x) nounwind uwtable readnone ssp {
entry:
%cmp = icmp ne i64 %x, 0
%conv1 = sext i1 %cmp to i64
ret i64 %conv1
; CHECK-LABEL: test16:
; CHECK: negq
; CHECK: sbbq
; ATOM-LABEL: test16:
; ATOM: negq
; ATOM: sbbq
}
define i16 @test17(i16 %x) nounwind {
entry:
%cmp = icmp ne i16 %x, 0
%sub = sext i1 %cmp to i16
ret i16 %sub
; CHECK-LABEL: test17:
; CHECK: negw
; CHECK: sbbw
; ATOM-LABEL: test17:
; ATOM: negw
; ATOM: sbbw
}
define i8 @test18(i32 %x, i8 zeroext %a, i8 zeroext %b) nounwind {
%cmp = icmp slt i32 %x, 15
%sel = select i1 %cmp, i8 %a, i8 %b
ret i8 %sel
; CHECK-LABEL: test18:
; CHECK: cmpl $15, %edi
; CHECK: cmovgel %edx
; ATOM-LABEL: test18:
; ATOM: cmpl $15, %edi
; ATOM: cmovgel %edx
}
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