[PATCH v2 16/40] tests/tcg/arm: Manually register allocate half-precision numbers

[Alex Bennée]

From: Akihiko Odaki <akihiko.odaki@daynix.com>

Clang does not allow specifying an integer as the value of a single
precision register.  Explicitly move value from a general register.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
[rth: Use one single inline asm block.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20240630190050.160642-12-richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/tcg/arm/fcvt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/tcg/arm/fcvt.c b/tests/tcg/arm/fcvt.c
index 157790e679..d8c61cd29f 100644
--- a/tests/tcg/arm/fcvt.c
+++ b/tests/tcg/arm/fcvt.c
@@ -355,7 +355,12 @@ static void convert_half_to_single(void)
 
         print_half_number(i, input);
 #if defined(__arm__)
-        asm("vcvtb.f32.f16 %0, %1" : "=w" (output) : "x" ((uint32_t)input));
+        /*
+         * Clang refuses to allocate an integer to a fp register.
+         * Perform the move from a general register by hand.
+         */
+        asm("vmov %0, %1\n\t"
+            "vcvtb.f32.f16 %0, %0" : "=w" (output) : "r" (input));
 #else
         asm("fcvt %s0, %h1" : "=w" (output) : "w" (input));
 #endif
-- 
2.39.2