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c950ffbe08
My recent ARM FastISel patch exposed this bug: http://llvm.org/bugs/show_bug.cgi?id=16178 The root cause is that it can't select integer sext/zext pre-ARMv6 and asserts out. The current integer sext/zext code doesn't handle other cases gracefully either, so this patch makes it handle all sext and zext from i1/i8/i16 to i8/i16/i32, with and without ARMv6, both in Thumb and ARM mode. This should fix the bug as well as make FastISel faster because it bails to SelectionDAG less often. See fastisel-ext.patch for this. fastisel-ext-tests.patch changes current tests to always use reg-imm AND for 8-bit zext instead of UXTB. This simplifies code since it is supported on ARMv4t and later, and at least on A15 both should perform exactly the same (both have exec 1 uop 1, type I). 2013-05-31-char-shift-crash.ll is a bitcode version of the above bug 16178 repro. fast-isel-ext.ll tests all sext/zext combinations that ARM FastISel should now handle. Note that my ARM FastISel enabling patch was reverted due to a separate failure when dealing with MCJIT, I'll fix this second failure and then turn FastISel on again for non-iOS ARM targets. I've tested "make check-all" on my x86 box, and "lnt test-suite" on A15 hardware. llvm-svn: 183551
58 lines
1.2 KiB
LLVM
58 lines
1.2 KiB
LLVM
; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s
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; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s
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; Sign-extend of i1 currently not supported by fast-isel
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;define signext i1 @ret0(i1 signext %a) nounwind uwtable ssp {
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;entry:
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; ret i1 %a
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;}
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define zeroext i1 @ret1(i1 signext %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret1
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; CHECK: and r0, r0, #1
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; CHECK: bx lr
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ret i1 %a
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}
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define signext i8 @ret2(i8 signext %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret2
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; CHECK: sxtb r0, r0
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; CHECK: bx lr
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ret i8 %a
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}
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define zeroext i8 @ret3(i8 signext %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret3
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; CHECK: and r0, r0, #255
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; CHECK: bx lr
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ret i8 %a
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}
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define signext i16 @ret4(i16 signext %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret4
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; CHECK: sxth r0, r0
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; CHECK: bx lr
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ret i16 %a
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}
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define zeroext i16 @ret5(i16 signext %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret5
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; CHECK: uxth r0, r0
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; CHECK: bx lr
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ret i16 %a
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}
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define i16 @ret6(i16 %a) nounwind uwtable ssp {
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entry:
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; CHECK: ret6
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; CHECK-NOT: uxth
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; CHECK-NOT: sxth
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; CHECK: bx lr
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ret i16 %a
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}
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