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This patch introduces some new define_insn rules to the nvptx backend,
to perform sign-extension of a truncation (from and to the same mode),
using a single cvt instruction. As an example, the following function
int foo(int x) { return (char)x; }
with -O2 currently generates:
mov.u32 %r24, %ar0;
mov.u32 %r26, %r24;
cvt.s32.s8 %value, %r26;
and with this patch, now generates:
mov.u32 %r24, %ar0;
cvt.s32.s8 %value, %r24;
This patch has been tested on nvptx-none hosted by x86_64-pc-linux-gnu
with a top-level "make" (including newlib) and a "make check" with no
new regressions.
gcc/ChangeLog:
* config/nvptx/nvptx.md (*extend_trunc_<mode>2_qi,
*extend_trunc_<mode>2_hi, *extend_trunc_di2_si): New insns.
Use cvt to perform sign-extension of truncation in one step.
gcc/testsuite/ChangeLog:
* gcc.target/nvptx/exttrunc-2.c: New test case.
* gcc.target/nvptx/exttrunc-3.c: New test case.
* gcc.target/nvptx/exttrunc-4.c: New test case.
* gcc.target/nvptx/exttrunc-5.c: New test case.
* gcc.target/nvptx/exttrunc-6.c: New test case.
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