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[PowerPC] Add a full condition code register to make the "cc" clobber work

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gcc inline asm supports specifying "cc" as a clobber of all condition
registers. Add just enough modeling of the full register to make this work.
Fixed PR19326.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205630 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2014-04-04 15:15:57 +00:00
parent dc404fff12
commit b12c642bbf
2 changed files with 82 additions and 0 deletions
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12
lib/Target/PowerPC/PPCRegisterInfo.td
View File

@ -188,6 +188,13 @@ def CR6 : CR<6, "cr6", [CR6LT, CR6GT, CR6EQ, CR6UN]>, DwarfRegNum<[74, 74]>;
def CR7 : CR<7, "cr7", [CR7LT, CR7GT, CR7EQ, CR7UN]>, DwarfRegNum<[75, 75]>;
}
// The full condition-code register. This is not modeled fully, but defined
// here primarily, for compatibility with gcc, to allow the inline asm "cc"
// clobber specification to work.
def CC : PPCReg<"cc">, DwarfRegAlias<CR0> {
let Aliases = [CR0, CR1, CR2, CR3, CR4, CR5, CR6, CR7];
}
// Link register
def LR : SPR<8, "lr">, DwarfRegNum<[-2, 65]>;
//let Aliases = [LR] in
@ -300,3 +307,8 @@ def VRSAVERC : RegisterClass<"PPC", [i32], 32, (add VRSAVE)>;
def CARRYRC : RegisterClass<"PPC", [i32], 32, (add CARRY)> {
let CopyCost = -1;
}
def CCRC : RegisterClass<"PPC", [i32], 32, (add CC)> {
let isAllocatable = 0;
}

70
test/CodeGen/PowerPC/cc.ll Normal file
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@ -0,0 +1,70 @@
; RUN: llc -mcpu=pwr7 < %s | FileCheck %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define i64 @test1(i64 %a, i64 %b) {
entry:
%c = icmp eq i64 %a, %b
br label %foo
foo:
call { i64, i64 } asm sideeffect "sc", "={r0},={r3},{r0},~{cr0},~{cr1},~{cr2},~{cr3},~{cr4},~{cr5},~{cr6},~{cr7}" (i64 %a)
br i1 %c, label %bar, label %end
bar:
ret i64 %b
end:
ret i64 %a
; CHECK-LABEL: @test1
; CHECK: mfcr [[REG1:[0-9]+]]
; CHECK-DAG: cmpd
; CHECK-DAG: mfocrf [[REG2:[0-9]+]],
; CHECK-DAG: stw [[REG1]], 8(1)
; CHECK-DAG: stw [[REG2]], -4(1)
; CHECK: sc
; CHECK: lwz [[REG3:[0-9]+]], -4(1)
; CHECK: mtocrf 128, [[REG3]]
; CHECK: lwz [[REG4:[0-9]+]], 8(1)
; CHECK-DAG: mtocrf 32, [[REG4]]
; CHECK-DAG: mtocrf 16, [[REG4]]
; CHECK-DAG: mtocrf 8, [[REG4]]
; CHECK: blr
}
define i64 @test2(i64 %a, i64 %b) {
entry:
%c = icmp eq i64 %a, %b
br label %foo
foo:
call { i64, i64 } asm sideeffect "sc", "={r0},={r3},{r0},~{cc}" (i64 %a)
br i1 %c, label %bar, label %end
bar:
ret i64 %b
end:
ret i64 %a
; CHECK-LABEL: @test2
; CHECK: mfcr [[REG1:[0-9]+]]
; CHECK-DAG: cmpd
; CHECK-DAG: mfocrf [[REG2:[0-9]+]],
; CHECK-DAG: stw [[REG1]], 8(1)
; CHECK-DAG: stw [[REG2]], -4(1)
; CHECK: sc
; CHECK: lwz [[REG3:[0-9]+]], -4(1)
; CHECK: mtocrf 128, [[REG3]]
; CHECK: lwz [[REG4:[0-9]+]], 8(1)
; CHECK-DAG: mtocrf 32, [[REG4]]
; CHECK-DAG: mtocrf 16, [[REG4]]
; CHECK-DAG: mtocrf 8, [[REG4]]
; CHECK: blr
}