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https://github.com/c64scene-ar/llvm-6502.git
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4cc1407b84
This allows common sp-offsets to be part of the instruction and is probably faster on modern CPUs too. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179977 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
2.5 KiB
LLVM
51 lines
2.5 KiB
LLVM
; RUN: llc -mtriple=armv7-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITH-LDRD
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; RUN: llc -mtriple=armv4-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITHOUT-LDRD
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; RUN: llc -mtriple=thumbv7-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITH-LDRD
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; RUN: llc -mtriple=thumbv7-none-linux-gnueabi -debug -o /dev/null < %s 2>&1 | FileCheck %s --check-prefix=INSTRS-ARE-THUMB
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define void @foo(i64* %addr) {
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%val1 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val2 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val3 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val4 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val5 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val6 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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%val7 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
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; Key point is that enough 64-bit paired GPR values are live that
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; one of them has to be spilled. This used to cause an abort because
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; an LDMIA was created with both a FrameIndex and an offset, which
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; is not allowed.
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; CHECK-WITH-LDRD: strd {{r[0-9]+}}, {{r[0-9]+}}, [sp, #8]
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; CHECK-WITH-LDRD: strd {{r[0-9]+}}, {{r[0-9]+}}, [sp]
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; CHECK-WITH-LDRD: ldrd {{r[0-9]+}}, {{r[0-9]+}}, [sp, #8]
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; CHECK-WITH-LDRD: ldrd {{r[0-9]+}}, {{r[0-9]+}}, [sp]
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; We also want to ensure the register scavenger is working (i.e. an
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; offset from sp can be generated), so we need two spills.
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; CHECK-WITHOUT-LDRD: add [[ADDRREG:[a-z0-9]+]], sp, #{{[0-9]+}}
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; CHECK-WITHOUT-LDRD: stm [[ADDRREG]], {r{{[0-9]+}}, r{{[0-9]+}}}
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; CHECK-WITHOUT-LDRD: stm sp, {r{{[0-9]+}}, r{{[0-9]+}}}
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; In principle LLVM may have to recalculate the offset. At the moment
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; it reuses the original though.
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; CHECK-WITHOUT-LDRD: ldm [[ADDRREG]], {r{{[0-9]+}}, r{{[0-9]+}}}
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; CHECK-WITHOUT-LDRD: ldm sp, {r{{[0-9]+}}, r{{[0-9]+}}}
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; Make sure we are actually creating the Thumb versions of the spill
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; instructions.
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; INSTRS-ARE-THUMB: t2STRDi8
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; INSTRS-ARE-THUMB: t2LDRDi8
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store volatile i64 %val1, i64* %addr
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store volatile i64 %val2, i64* %addr
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store volatile i64 %val3, i64* %addr
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store volatile i64 %val4, i64* %addr
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store volatile i64 %val5, i64* %addr
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store volatile i64 %val6, i64* %addr
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store volatile i64 %val7, i64* %addr
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ret void
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}
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