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[ARM] TypeSize lower bound for ARMCodeGenPrepare 

We only try to promote types with are smaller than 16-bits, but we
also need to check that the type is not less than 8-bits.

Differential Revision: https://reviews.llvm.org/D50769

llvm-svn: 339770
This commit is contained in:
Sam Parker 2018-08-15 13:29:50 +00:00
parent 8b4bd09e22
commit fabf7fe5f8
2 changed files with 25 additions and 1 deletions
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2
llvm/lib/Target/ARM/ARMCodeGenPrepare.cpp
View File

@ -562,7 +562,7 @@ bool ARMCodeGenPrepare::isLegalToPromote(Value *V) {
bool ARMCodeGenPrepare::TryToPromote(Value *V) { bool ARMCodeGenPrepare::TryToPromote(Value *V) {
OrigTy = V->getType(); OrigTy = V->getType();
TypeSize = OrigTy->getPrimitiveSizeInBits(); TypeSize = OrigTy->getPrimitiveSizeInBits();
if (TypeSize > 16) if (TypeSize > 16 || TypeSize < 8)
return false; return false;
if (!isSupportedValue(V) || !shouldPromote(V) || !isLegalToPromote(V)) if (!isSupportedValue(V) || !shouldPromote(V) || !isLegalToPromote(V))

24
llvm/test/CodeGen/ARM/arm-cgp-icmps.ll
View File

@ -256,3 +256,27 @@ define i32 @icmp_not(i16 zeroext %arg0, i16 zeroext %arg1) {
ret i32 %res ret i32 %res
} }
; CHECK-COMMON-LABEL: icmp_i1
; CHECK-NOT: uxt
define i32 @icmp_i1(i1* %arg0, i1 zeroext %arg1, i32 %a, i32 %b) {
entry:
%load = load i1, i1* %arg0
%not = xor i1 %load, 1
%cmp = icmp eq i1 %arg1, %not
%res = select i1 %cmp, i32 %a, i32 %b
ret i32 %res
}
; CHECK-COMMON-LABEL: icmp_i7
; CHECK-COMMON: ldrb
; CHECK-COMMON: and
; CHECK-COMMON: cmp
define i32 @icmp_i7(i7* %arg0, i7 zeroext %arg1, i32 %a, i32 %b) {
entry:
%load = load i7, i7* %arg0
%add = add nuw i7 %load, 1
%cmp = icmp ult i7 %arg1, %add
%res = select i1 %cmp, i32 %a, i32 %b
ret i32 %res
}