[ShrinkWrap][NFC] Test with load from constant pool preventing shrink #162476
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| --- | | ||
| ; RUN: llc -x=mir -simplify-mir -run-pass=shrink-wrap -o - %s | FileCheck %s | ||
| ; CHECK-NOT: savePoint | ||
| ; CHECK-NOT: restorePoint | ||
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There was a problem hiding this comment. Could you add a comment on what this is testing and what we are checking here? |
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| declare double @foo() | ||
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| define double @shrink_wrap_load_from_const_pool(double %q) { | ||
| entry: | ||
| %0 = fcmp oeq double %q, 3.125500e+02 | ||
| br i1 %0, label %common.ret, label %if.else | ||
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| common.ret: ; preds = %if.else, %entry, %exit1 | ||
| %common.ret.op = phi double [ %3, %exit1 ], [ 0.000000e+00, %entry ], [ 0.000000e+00, %if.else ] | ||
| ret double %common.ret.op | ||
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| if.else: ; preds = %entry | ||
| %1 = call double @foo() | ||
| %2 = fcmp oeq double %1, 0.000000e+00 | ||
| br i1 %2, label %exit1, label %common.ret | ||
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| exit1: ; preds = %if.else | ||
| %3 = call double @foo() | ||
| br label %common.ret | ||
| } | ||
| ... | ||
| # Following code has a load from constant pool. Accessing constant pool must not | ||
| # be considered as a stack access and hence, shrink wrapping must happen. | ||
| --- | ||
| name: shrink_wrap_load_from_const_pool | ||
| tracksRegLiveness: true | ||
| constants: | ||
| - id: 0 | ||
| value: 'double 3.125500e+02' | ||
| alignment: 8 | ||
| body: | | ||
| bb.0.entry: | ||
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There was a problem hiding this comment. Get rid of the There was a problem hiding this comment. keeping the IR names for the reason mentioned above. |
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| successors: %bb.4(0x50000000), %bb.2(0x30000000) | ||
| liveins: $d0 | ||
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| renamable $d1 = COPY $d0 | ||
| renamable $x8 = ADRP target-flags(aarch64-page) %const.0 | ||
| renamable $d2 = LDRDui killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) %const.0 :: (load (s64) from constant-pool) | ||
| renamable $d0 = FMOVD0 | ||
| nofpexcept FCMPDrr killed renamable $d1, killed renamable $d2, implicit-def $nzcv, implicit $fpcr | ||
| Bcc 1, %bb.2, implicit killed $nzcv | ||
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| bb.4: | ||
| liveins: $d0 | ||
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| bb.1.common.ret: | ||
| liveins: $d0 | ||
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| RET_ReallyLR implicit $d0 | ||
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| bb.2.if.else: | ||
| successors: %bb.3(0x50000000), %bb.1(0x30000000) | ||
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| ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp | ||
| BL @foo, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $d0 | ||
| ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp | ||
| renamable $d1 = COPY $d0 | ||
| renamable $d0 = FMOVD0 | ||
| nofpexcept FCMPDri killed renamable $d1, implicit-def $nzcv, implicit $fpcr | ||
| Bcc 1, %bb.1, implicit killed $nzcv | ||
| B %bb.3 | ||
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| bb.3.exit1: | ||
| ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp | ||
| BL @foo, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $d0 | ||
| ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp | ||
| B %bb.1 | ||
| ... | ||
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Do you need the LLVM section?
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I feel it can just be removed
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IR section is not needed. But, for someone like me who is not that great with codegen, I feel LLVM IR gives good sense of how the mir code was derived in the first place.
If you still insist, will remove it.