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Make FastEmit_ri_ try a bit harder to succeed for supported operations; FastEmit_i can fail for non-Thumb2 ARM. Makes ARMSimplifyAddress work correctly, and reduces the number of fast-isel bailouts on non-Thumb ARM.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-04-29 23:34:52 +00:00
parent 5ac179ccd2
commit b2b03fc2fa
2 changed files with 17 additions and 4 deletions
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9
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -1032,8 +1032,13 @@ unsigned FastISel::FastEmit_ri_(MVT VT, unsigned Opcode,
if (ResultReg != 0)
return ResultReg;
unsigned MaterialReg = FastEmit_i(ImmType, ImmType, ISD::Constant, Imm);
if (MaterialReg == 0)
return 0;
if (MaterialReg == 0) {
// This is a bit ugly/slow, but failing here means falling out of
// fast-isel, which would be very slow.
const IntegerType *ITy = IntegerType::get(FuncInfo.Fn->getContext(),
VT.getSizeInBits());
MaterialReg = getRegForValue(ConstantInt::get(ITy, Imm));
}
return FastEmit_rr(VT, VT, Opcode,
Op0, Op0IsKill,
MaterialReg, /*Kill=*/true);

12
test/CodeGen/ARM/fast-isel.ll
View File

@ -38,14 +38,22 @@ define void @test2(i32 %tmp, i32* %ptr) nounwind {
; ARM: test2:
b1:
%b = add i32 %tmp, 4096
store i32 %b, i32* %ptr
%a = add i32 %tmp, 4096
store i32 %a, i32* %ptr
br label %b2
; THUMB: add.w {{.*}} #4096
; ARM: add {{.*}} #1, #20
b2:
%b = add i32 %tmp, 4095
store i32 %b, i32* %ptr
br label %b3
; THUMB: addw {{.*}} #4095
; ARM: movw {{.*}} #4095
; ARM: add
b3:
%c = or i32 %tmp, 4
store i32 %c, i32* %ptr
ret void