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86a1a67b
by Andreas Klebinger at 2026-08-24T23:14:26-04:00
cmm dumps: Add machop width info with -dppr-debug for infix ops.
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20b0771c
by Andreas Klebinger at 2026-08-24T23:14:27-04:00
CmmLint: Check for unsupported MachOp widths
machOpArgReps now maps MachOp + Width to a list of supported
argument widths or Nothing if the given operation is not supported
at the given width.
This allows us to check for nonsensical combinations like FloatToInt
at Word16.
Similarly we now check that every address is actually wordwidth.
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4d868ccd
by Andreas Klebinger at 2026-08-24T23:14:27-04:00
arm64 ncg: The big subword truncation fix.
A set of slightly related fixes to arm subword handling:
Bitmask immediates:
Don't produce overflowing assembly literals.
There is still another bug here that causes us to miss some valid
literals but we will fix that later.
Improve subword truncation handling:
We now use a small set of helpers to truncate `Register` values rather
than truncating immediate `Reg` values which greatly simplifies the code
structure. This fixes a great many bugs to do with sign/zero extending subwords
or the lack thereof.
We now establish the invariant that subword values are zero-extended at
every site at which they come into "scope" of the ncg, and rely on the
invariant throughout rather than pessimistically inserting redundant
extensions in a hodgepodge manner at the use sites of these values.
This fixes at least the bugs described in issues #27533, #27430
#27537, #27538, #27539, and #27550. But likely more bugs yet not
found.
Subword ffi results:
Apply truncations when calling functions returning
subword values.
genCondJump:
Don't sign extend signed values in the input register as
it might map to a local variable, corrupting the value stored within.
Fix subword store/load instructions.:
We used to read those at 32bit width even for smaller values possibly
resulting in invalid memory access. Now we construct the suffix for
subword variants based on the instruction format for these.
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374030cb
by Andreas Klebinger at 2026-08-24T23:14:27-04:00
arm64 ncg: Fix MO_V_Broadcast for non-literals.
We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register.
Also adds a test. Fixes #27565.
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7470d089
by Andreas Klebinger at 2026-08-24T23:14:27-04:00
Add some test cases covering bugs in the arm ncg.
* Test for #27430 (subword ffi results)
* #27537 - subword conversions
* #27538 - subwords used in conditional
* #27533 - single byte read
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7b351c71
by Andreas Klebinger at 2026-08-24T23:14:27-04:00
cmmLint: Lint against MO_FS_Truncate subword use.
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859e2e1c
by Andreas Klebinger at 2026-08-24T23:14:29-04:00
rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64
We accidentally operated over `uint64_t*` when we should use `uint8_t`.
Fixes #27569
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749c5957
by Alan Zimmerman at 2026-08-24T23:14:31-04:00
EPA: Uses Parsers.parseModule for exactprint tests
Parsers.parseModule is the advertised way to parse for use for exact
printing in the ghc-exactprint library. This commit updates the GHC
exact print testing to use it.
This requires moving the comment balancing that was occurring
only in the test path into the advertising parser path, so it moves
from Transforms.hs to Utils.hs.
Also update the comment adding to honour trailing annotations