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bb6d824b20
This was picking a concrete size for a physical register, and enforcing exact match on the virtual register's type size. Some targets add multiple types to a register class, and some are smaller than the full bit width. For example x86 adds f32 to 128-bit xmm registers, and AMDGPU adds i16/f16 to 32-bit registers. It might be better to represent these cases as a copy of the full register and an extraction of the subpart, but a lot of code assumes you can directly copy. This will help fix the current usage of the DAG calling convention infrastructure which is incompatible with how GlobalISel is now using it. The API is somewhat cumbersome here, but I just mirrored the existing functions, except now with LLTs (and allow returning null on failure, unlike the MVT version). I think the concept of selecting register classes based on type is flawed to begin with, but I'm trying to keep this compatible with the existing handling.
55 lines
1.7 KiB
YAML
55 lines
1.7 KiB
YAML
#RUN: not --crash llc -march=x86-64 -run-pass=none -verify-machineinstrs -o /dev/null %s 2>&1 | FileCheck %s
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# REQUIRES: x86-registered-target
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# These copies have mismatched type sizes that are allowed because the
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# register class is defined to directly include the narrower type.
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---
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name: test_valid_copies
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $xmm0, $xmm1, $xmm2, $xmm3, $xmm4
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%0:_(s32) = COPY $xmm0
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%1:_(s64) = COPY $xmm1
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%2:_(s128) = COPY $xmm2
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%3:_(<4 x s32>) = COPY $xmm3
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%4:_(<2 x s64>) = COPY $xmm4
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$xmm0 = COPY %0
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$xmm1 = COPY %1
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$xmm2 = COPY %2
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$xmm3 = COPY %3
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$xmm4 = COPY %4
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...
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---
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name: test_invalid_copies
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $xmm0, $xmm1, $xmm2, $xmm3
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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%0:_(s16) = COPY $xmm0
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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%1:_(<4 x s16>) = COPY $xmm1
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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%2:_(s256) = COPY $xmm2
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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%3:_(<8 x s32>) = COPY $xmm3
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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$xmm0 = COPY %0
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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$xmm1 = COPY %1
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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$xmm2 = COPY %2
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; CHECK: *** Bad machine code: Copy Instruction is illegal with mismatching sizes ***
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$xmm3 = COPY %3
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...
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