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riscv: Fix unsigned 32bit loads

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the invariant for the risc-v codegen is, that 64bit regs
generally contain the sign-extension of a 32bit value.
This wasn't heeded by loads of 32bit values from memory, which
used lwu and ultimately caused a miscompilation in string_test
of tcctest.c.

Now most of tcctest.c works (not with -run, but with linking
a real executable), except some ftoi/ftof conversions.
This commit is contained in:
Michael Matz 2019-07-22 01:27:08 +02:00
parent 2668eda595
commit 69c77d1597
1 changed files with 1 additions and 1 deletions
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2
riscv64-gen.c
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@ -155,7 +155,7 @@ ST_FUNC void load(int r, SValue *sv)
if (bt == VT_FUNC)
size = PTR_SIZE;
func3 = size == 1 ? 0 : size == 2 ? 1 : size == 4 ? 2 : 3;
if (size < 8 && !is_float(sv->type.t) && (sv->type.t & VT_UNSIGNED))
if (size < 4 && !is_float(sv->type.t) && (sv->type.t & VT_UNSIGNED))
func3 |= 4;
}
if (v == VT_LOCAL) {