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bors 0df0662ee0 Auto merge of #104693 - jhorstmann:use-high-bit-of-mask-for-select, r=workingjubilee 
Consistently use the highest bit of vector masks when converting to i1 vectors

This improves the codegen for vector `select`, `gather`, `scatter` and boolean reduction intrinsics and fixes rust-lang/portable-simd#316.

The current behavior of most mask operations during llvm codegen is to truncate the mask vector to <N x i1>, telling llvm to use the least significat bit. The exception is the `simd_bitmask` intrinsics, which already used the most signifiant bit.

Since sse/avx instructions are defined to use the most significant bit, truncating means that llvm has to insert a left shift to move the bit into the most significant position, before the mask can actually be used.

Similarly on aarch64, mask operations like blend work bit by bit, repeating the least significant bit across the whole lane involves shifting it into the sign position and then comparing against zero.

By shifting before truncating to <N x i1>, we tell llvm that we only consider the most significant bit, removing the need for additional shift instructions in the assembly.
2025-01-26 22:45:21 +00:00
..
asm tests/assembly/asm: Remove uses of rustc_attrs and lang_items features by using minicore 2024-12-18 02:59:07 +09:00
auxiliary Move /src/test to /tests 2023-01-11 09:32:08 +00:00
compiletest-self-test tests/assembly: add minicore compiletest self-test 2024-10-31 18:20:11 +08:00
libs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-kernel-abi NVPTX:_Especially add the DoubleI32 struct as a nvptx abi test case since it was used as an example when discussing possible problems 2024-05-31 23:12:33 +02:00
simd Ignore reduce-fadd-unordered on SGX platform 2024-09-16 16:54:48 +02:00
stack-protector Update the minimum external LLVM to 18 2024-09-18 13:53:31 -07:00
targets add nto80 x86-64 and aarch64 target 2025-01-24 12:41:49 +00:00
aarch64-naked-fn-no-bti-prolog.rs more asm! -> naked_asm! in tests 2024-10-06 18:12:25 +02:00
aarch64-pointer-auth.rs rustc_codegen_llvm: Add a new 'pc' option to branch-protection 2024-10-31 11:59:17 +00:00
align_offset.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
breakpoint.rs Add core::arch::breakpoint and test 2024-12-02 23:56:24 -08:00
closure-inherit-target-feature.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
cmse.rs Improve assembly test for CMSE ABIs 2024-09-23 18:57:38 +02:00
dwarf4.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
dwarf5.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
is_aligned.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
issue-83585-small-pod-struct-equality.rs Fix tests for 32 bits targets 2024-06-11 07:45:16 +00:00
manual-eq-efficient.rs Add test for efficient codegen of manual eq implementations of a small struct 2024-04-30 13:21:08 +00:00
niche-prefer-zero.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-arch-default.rs NVPTX: Enable previously disabled tests 2024-03-11 13:35:58 +01:00
nvptx-arch-emit-asm.rs NVPTX: Enable previously disabled tests 2024-03-11 13:35:58 +01:00
nvptx-arch-link-arg.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-arch-target-cpu.rs NVPTX: Enable previously disabled tests 2024-03-11 13:35:58 +01:00
nvptx-atomics.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-c-abi-arg-v7.rs NVPTX:_Especially add the DoubleI32 struct as a nvptx abi test case since it was used as an example when discussing possible problems 2024-05-31 23:12:33 +02:00
nvptx-c-abi-ret-v7.rs NVPTX:_Especially add the DoubleI32 struct as a nvptx abi test case since it was used as an example when discussing possible problems 2024-05-31 23:12:33 +02:00
nvptx-internalizing.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-linking-binary.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-linking-cdylib.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nvptx-safe-naming.rs NVPTX: Enable previously disabled tests 2024-03-11 13:35:58 +01:00
panic-no-unwind-no-uwtable.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
panic-unwind-no-uwtable.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
pic-relocation-model.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
pie-relocation-model.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
powerpc64-struct-abi.rs allow different sized load and store 2025-01-23 20:53:04 -05:00
riscv-soft-abi-with-float-features.rs tests: use max-llvm-major-version instead of ignore-llvm-version range like N - 99 2024-11-14 17:44:54 +08:00
rust-abi-arg-attr.rs remove support for rustc_safe_intrinsic attribute; use rustc_intrinsic functions instead 2024-11-08 09:16:00 +01:00
s390x-backchain-toggle.rs tests: add an assembly scanning test for s390x backchain switch 2024-09-04 08:10:53 -06:00
s390x-vector-abi.rs Support s390x z13 vector ABI 2024-11-14 22:14:11 +09:00
simd-bitmask.rs Update the minimum external LLVM to 18 2024-09-18 13:53:31 -07:00
simd-intrinsic-gather.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
simd-intrinsic-mask-load.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
simd-intrinsic-mask-reduce.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
simd-intrinsic-mask-store.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
simd-intrinsic-scatter.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
simd-intrinsic-select.rs Consistently use the most significant bit of vector masks 2025-01-26 16:44:23 +01:00
slice-is_ascii.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
small_data_threshold.rs small_data_threshold.rs: Adapt to LLVM head changes 2024-09-12 09:53:59 +02:00
sparc-struct-abi.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
stack-probes.rs Update the minimum external LLVM to 18 2024-09-18 13:53:31 -07:00
static-relocation-model.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
strict_provenance.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
target-feature-multiple.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
wasm32-naked-fn.rs work around the wasm32-unknown-unknown ABI being broken 2025-01-20 16:57:09 +01:00
wasm_exceptions.rs Fix wasm_exceptions test 2024-06-19 21:26:48 +01:00
x86-return-float.rs adjust asm test 2024-10-22 12:21:00 +01:00
x86_64-array-pair-load-store-merge.rs Make more of the test suite run on Mac Catalyst 2024-05-28 12:31:33 +02:00
x86_64-bigint-helpers.rs Fix x86_64-bigint-helpers test on LLVM 20 2025-01-23 10:15:04 +01:00
x86_64-cmp.rs tests: use max-llvm-major-version instead of ignore-llvm-version range like N - 99 2024-11-14 17:44:54 +08:00
x86_64-floating-point-clamp.rs Add inline comments why we're forcing the target cpu 2024-05-01 16:54:20 -07:00
x86_64-fortanix-unknown-sgx-lvi-generic-load.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
x86_64-fortanix-unknown-sgx-lvi-generic-ret.rs Run rustfmt on tests/assembly/. 2024-05-30 16:15:46 +10:00
x86_64-fortanix-unknown-sgx-lvi-inline-assembly.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
x86_64-function-return.rs Make more of the test suite run on Mac Catalyst 2024-05-28 12:31:33 +02:00
x86_64-naked-fn-no-cet-prolog.rs more asm! -> naked_asm! in tests 2024-10-06 18:12:25 +02:00
x86_64-no-jump-tables.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
x86_64-sse_crc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
x86_64-typed-swap.rs Avoid non-windows non-linux in assembly x64 test 2024-03-23 00:02:53 -07:00
x86_64-windows-float-abi.rs Match LLVM ABI in extern "C" functions for f128 on Windows 2024-07-30 20:23:33 +01:00